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Mind quotes

Source-backed quotations about thought, judgment, perspective, attention, imagination, belief, and the ways interpretation changes experience.

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Source identified1
When you have eliminated the impossible whatever remains, however improbable, must be the truth.

“When you have eliminated the impossible whatever remains, however improbable, must be the truth.”

Holmes presents elimination as a reasoning discipline: once genuinely impossible explanations are removed, attention must turn to the remaining explanation even when it initially seems unlikely.

Source details

The Sign of the Four, Chapter VI, ‘Sherlock Holmes Gives a Demonstration,’ Project Gutenberg #2097. Holmes tells Watson that after eliminating impossible entry routes, ‘whatever remains, however improbable, must be the truth,’ then applies the precept to the locked-room investigation and the hole in the roof. It is fictional detective reasoning in a specific evidential setup, not a universal rule that any improbable remaining hypothesis is automatically true without sound premises or exhaustive elimination.

Source identified2
And this is why knowledge is more honourable and excellent than true opinion, because fastened by a chain.
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“And this is why knowledge is more honourable and excellent than true opinion, because fastened by a chain.”

Voice: Dialogue speaker · Socrates

Socrates compares an accurate opinion with understanding that can remain stable because it is connected to an explanation. In his illustration, true beliefs are useful but may slip away until they are secured by an account of their causes; the chain is a metaphor, not a claim about literal memory storage.

Source details

Meno, around Stephanus 97e–98a, Socrates addressing Meno after the Daedalus-statue comparison. The quoted standalone sentence immediately follows Socrates’s argument that right opinions can guide action but need to be tied down by an account of their cause. Benjamin Jowett English translation, Project Gutenberg #1643. The text and translational phrasing are Jowett’s; the dialogue does not treat every true opinion as worthless.

Source identified3
And yet, O my friend, if true opinion in law courts and knowledge are the same, the perfect judge could not have judged rightly without knowledge; and therefore I must infer that they are not the same.
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“And yet, O my friend, if true opinion in law courts and knowledge are the same, the perfect judge could not have judged rightly without knowledge; and therefore I must infer that they are not the same.”

Voice: Dialogue speaker · Socrates

Socrates argues that someone can arrive at a correct judgment on testimony without having witnessed or known the event firsthand. The example tests Theaetetus’s proposal that knowledge simply equals true opinion; the dialogue continues to investigate other proposed definitions rather than announcing a simple final formula.

Source details

Theaetetus, around Stephanus 201a–c, Socrates explaining his law-court counterexample while speaking with Theaetetus. Benjamin Jowett English translation, Project Gutenberg #1726. The full sentence is spoken by Socrates in the dramatic dialogue, not from Jowett’s prefatory commentary; no claim is made about modern evidence law.

Source identified4
My subject was mental efficiency as a means to self-development.

“My subject was mental efficiency as a means to self-development.”

Efficiency is presented as instrumental rather than an end in itself: better use of attention and thought is valuable insofar as it supports deliberate personal development.

Source details

Mental Efficiency. Bennett explicitly defines the scope of his argument as mental efficiency serving self-development; this is period conduct-of-life writing rather than modern cognitive-science evidence.

Source identified5
Satire is of the nature of moral philosophy, as being instructive;

“Satire is of the nature of moral philosophy, as being instructive;”

Dryden treats satire as a literary form whose purpose includes moral instruction, then compares how classical satirists pursue that end.

Source details

A Discourse Concerning the Original and Progress of Satire, represented in Project Gutenberg #2615. 'Satire is of the nature of moral philosophy, as being instructive' occurs inside Dryden's comparison of Persius, Juvenal and Horace, immediately before his account of Persius's Stoic moral teaching. The source does not expose a formal subsection corresponding to the queue parser's incidental 'Discourse C' clue, so this record is routed directly to the reviewed passage without inventing a structural heading. It remains Restoration literary criticism and moral theory rather than a timeless definition binding every modern satire.

Source identified6
And thought is best when the mind is gathered into herself and none of these things trouble her—neither sounds nor sights nor pain nor any pleasure,—when she takes leave of the body, and has as little as possible to do with it, when she has no bodily sense or desire, but is aspiring after true being?
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“And thought is best when the mind is gathered into herself and none of these things trouble her—neither sounds nor sights nor pain nor any pleasure,—when she takes leave of the body, and has as little as possible to do with it, when she has no bodily sense or desire, but is aspiring after true being?”

Voice: Dialogue speaker · Socrates

Socrates argues that philosophical reflection is clearest when bodily sensations do not distract the soul from its inquiry. This belongs to his metaphysical case about knowledge, body and soul on the day of his death; it should not be confused with a modern scientific finding about the brain or with a general prohibition on sensory experience.

Source details

Plato, Phaedo, approximately 65c–d; Socrates speaking with Simmias about the philosopher’s pursuit of true being and the limits of bodily perception. Benjamin Jowett English, Project Gutenberg #1658, dramatic text (not the editorial introduction).

Source identified7
If a man's thoughts are not dissipated, if his mind is not perplexed, if he has ceased to think of good or evil, then there is no fear for him while he is watchful.

“If a man's thoughts are not dissipated, if his mind is not perplexed, if he has ceased to think of good or evil, then there is no fear for him while he is watchful.”

The verse connects watchfulness with freedom from mental scattering and fear, describing a mind that is not constantly pulled apart by confused or reactive thought.

Source details

Dhammapada 39, Max Müller translation; its religious vocabulary belongs to the text’s discipline of watchful thought and should not be reduced to a clinical claim about anxiety.

Source identified8
the terms good and evil are only applied relatively, so that the same thing may be called both good and bad according to the relations in view,

“the terms good and evil are only applied relatively, so that the same thing may be called both good and bad according to the relations in view,”

Spinoza asks readers to examine evaluative terms in relation to purposes and comparisons instead of assuming that every judgment of good or bad names an absolute property.

Source details

On the Improvement of the Understanding, section 12, Project Gutenberg #1016 in R. H. M. Elwes's public-domain English translation. Spinoza says the terms good and evil are applied relatively while introducing his distinction between ordinary relative goods and the true/highest good sought by the unfinished treatise. It remains translation-mediated seventeenth-century methodological philosophy rather than a claim that all moral distinctions are meaningless.

Source identified9
Twice two makes five is sometimes a very charming thing too.

“Twice two makes five is sometimes a very charming thing too.”

Voice: Fictional narrator · Underground Man

The absurd equation represents the human impulse to resist perfect rational calculation simply to preserve a sense of independent choice.

Source details

Notes from Underground, Part I, Chapter IX, Constance Garnett translation. The “twice two makes five” line immediately follows the narrator’s complaint about mathematical certainty. Verified against Project Gutenberg #600 and the 1918 Heinemann White Nights and Other Stories Wikisource text.

Source identified11
What a long time it requires to know ourselves, and yet every one has more of this knowledge than he is willing to own.

“What a long time it requires to know ourselves, and yet every one has more of this knowledge than he is willing to own.”

Self-knowledge develops slowly, and the second clause suggests that people may resist acknowledging what experience has already taught them about their own motives or limitations.

Source details

Letters Written During a Short Residence in Sweden, Norway, and Denmark, Letter IX; represented Cassell & Company 1889 text in Project Gutenberg #3529. The frozen catalog reads “What a long time it requires to know ourselves, and yet every one has more of this knowledge than he is willing to own,” while the represented witness reads “What a long time it requires to know ourselves; and yet almost every one has more of this knowledge than he is willing to own, even to himself.” This collection retains its legacy shortened wording and explicitly records the omitted “almost” / closing phrase rather than silently rewriting it. Wollstonecraft is reflecting on her own solitude, experience and knowledge of the heart.

Source identified12
He who knows only his own side of the case, knows little of that.

“He who knows only his own side of the case, knows little of that.”

Understanding a position requires serious contact with competing arguments; familiarity with only one side can produce confidence without real comprehension.

Source details

On Liberty, Chapter 2; Mill argues for open discussion because opposing views expose weaknesses and sharpen understanding.

Source identified13
The happiness of your life depends upon the quality of your thoughts.

“The happiness of your life depends upon the quality of your thoughts.”

The line emphasizes the role of habitual judgment in shaping lived experience, a recurring theme in Stoic practice.

Source details

Common English rendering of a passage in Meditations; wording varies by translation.

Source identified14
It were not best that we should all think alike; it is difference of opinion that makes horse-races.

“It were not best that we should all think alike; it is difference of opinion that makes horse-races.”

Voice: Epigraph / fictional source voice · Pudd’nhead Wilson’s Calendar

Twain turns pluralism into a betting joke: disagreement is presented not as abstract virtue but as the practical condition that makes a horse race worth wagering on.

Source details

Pudd’nhead Wilson, Chapter XIX epigraph; a Calendar maxim paired with the good-example line.

Source identified16
Aiming thus at something else, they find happiness by the way.

“Aiming thus at something else, they find happiness by the way.”

Mill’s mature view is that happiness is often an indirect result of sustained attention to worthwhile people, work, art, or purposes beyond constant self-measurement.

Source details

Autobiography, Chapter V; this sentence concludes Mill’s reflection that happiness is better approached indirectly than made the sole object of scrutiny.

Source identified17
To define is to limit.

“To define is to limit.”

Voice: Fictional character · Lord Henry Wotton

Definitions clarify ideas but can also narrow them, especially when a label is treated as the complete reality of a person or experience.

Source details

The Picture of Dorian Gray, 1891 edition, Chapter 17; Lord Henry answers the Duchess of Monmouth’s question “What are you?” with “To define is to limit.”

Source identified18
And we are so miserably afraid of the light, all of us.

“And we are so miserably afraid of the light, all of us.”

Voice: Fictional character · Mrs. Alving

Mrs. Alving uses light as a metaphor for confronting inherited beliefs, arguing that people can remain frightened of examining ideas that continue to govern them.

Source details

Ghosts, Act II, R. Farquharson Sharp public-domain translation, Project Gutenberg #2467. Mrs. Alving says “And we are so miserably afraid of the light, all of us” immediately after describing inherited “old dead ideas” and beliefs as ghosts. The light is a dramatic metaphor within a conflict over family, duty and conventional belief, not a clinical claim.

Source identified19
by the constant growth of insight and knowledge, this intellectual life, like a slowly-forming work of art, will acquire a consistency, a permanent intensity, a unity which becomes ever more and more complete

“by the constant growth of insight and knowledge, this intellectual life, like a slowly-forming work of art, will acquire a consistency, a permanent intensity, a unity which becomes ever more and more complete”

The image treats intellectual development as cumulative craftsmanship: insight and knowledge gradually produce greater coherence instead of appearing as a single finished achievement.

Source details

The Wisdom of Life, T. Bailey Saunders translation; Project Gutenberg #10741. The simile compares a developing intellectual life with a slowly formed work of art.

Source identified20
Expectation is ever on tiptoe.

“Expectation is ever on tiptoe.”

Curiosity keeps the observer mentally ready because the next small discovery may appear before it can be predicted or scheduled.

Source details

Wake-Robin; Burroughs describes the anticipatory state created by close engagement with birds, seasons, and other natural signs.

Source identified21
If all mankind minus one, were of one opinion, and only one person were of the contrary opinion, mankind would be no more justified in silencing that one person, than he, if he had the power, would be justified in silencing mankind.

“If all mankind minus one, were of one opinion, and only one person were of the contrary opinion, mankind would be no more justified in silencing that one person, than he, if he had the power, would be justified in silencing mankind.”

Mill makes the number of people holding an opinion irrelevant to their right to silence dissent: minority speech remains worth protecting even when nearly everyone else believes it wrong.

Source details

On Liberty, Chapter II, Project Gutenberg #34901. Mill’s next argument is epistemic as well as political: suppressing an opinion can deprive everyone of truth or of the clearer understanding created when truth is tested against error.

Source identified22
I mean to say, Laches, that courage is the knowledge of that which inspires fear or confidence in war, or in anything.
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“I mean to say, Laches, that courage is the knowledge of that which inspires fear or confidence in war, or in anything.”

Voice: Dialogue speaker · Nicias

Nicias suggests that courageous judgment depends on understanding when danger deserves fear and when there is reason for confidence. Laches disputes the link between courage and specialized knowledge, and Socrates presses Nicias on what knowledge of future good or evil entails. It remains a hypothesis under examination, not a definitive philosophical verdict.

Source details

Laches, around Stephanus 194e–195a, Benjamin Jowett English, Project Gutenberg #1584. Nicias speaks to Laches after Socrates invites an alternative to Laches’s endurance account; subsequent questioning probes the scope of knowledge about fear and hope and leaves the inquiry unresolved. The local dramatic speaker is Nicias, not Plato personally. The wording occurs in the dialogue body, not Jowett’s introduction.

Source identified23
The “I” in me, my friend, dwells in the house of silence.

“The “I” in me, my friend, dwells in the house of silence.”

Gibran imagines an inner self that cannot be completely translated into performance or conversation, preserving a private dimension beneath social identity.

Source details

The Madman, “My Friend”; the image follows the claim that the speaker is not identical with what others see.

Source identified24
The mind that is disciplined by Purity and fortified by Wisdom, avoids all those lusts and desires which are inseparably bound up with affliction, and so arrives at enlightenment and peace.

“The mind that is disciplined by Purity and fortified by Wisdom, avoids all those lusts and desires which are inseparably bound up with affliction, and so arrives at enlightenment and peace.”

Allen links peace with disciplined attention and the cultivation of what he calls purity and wisdom, treating peace as the outcome of a moral practice rather than a momentary mood.

Source details

Out from the Heart, “The Nature and Power of Mind,” represented New York R. F. Fenno & Company edition, Project Gutenberg #74178. Allen contrasts an undisciplined attitude toward experience with a mind disciplined by his moral ideals; the passage is historical conduct-of-life teaching, not medical or therapeutic guidance.

Source identified25
The man who has no tincture of philosophy goes through life imprisoned in the prejudices derived from common sense, from the habitual beliefs of his age or his nation, and from convictions which have grown up in his mind without the co-operation or consent of his deliberate reason.

“The man who has no tincture of philosophy goes through life imprisoned in the prejudices derived from common sense, from the habitual beliefs of his age or his nation, and from convictions which have grown up in his mind without the co-operation or consent of his deliberate reason.”

Unexamined common sense can become a prison when inherited assumptions are accepted automatically instead of being tested by deliberate reasoning.

Source details

The Problems of Philosophy, Chapter XV, “The Value of Philosophy,” beginning on printed page 242 / scan leaf 246 and continuing onto printed page 243 / scan leaf 247 in the fully validated 1912 Williams & Norgate Wikisource scan, cross-checked against Project Gutenberg #5827. The “no tincture of philosophy” sentence criticizes inherited common-sense, national and habitual prejudices that have not been examined by deliberate reason; it remains Russell’s philosophical argument rather than a diagnosis of people who do not study philosophy.

Source identified26
We ought, however, first to examine our own selves, next the business which we propose to transact, next those for whose sake or in whose company we transact it.

“We ought, however, first to examine our own selves, next the business which we propose to transact, next those for whose sake or in whose company we transact it.”

Before committing to action, Seneca asks for an ordered examination of self, task, and company, treating clear self-knowledge as protection against avoidable agitation and mismatch.

Source details

Of Peace of Mind, section VI, Aubrey Stewart translation (1889), cross-checked against Project Gutenberg #64576 and Wikisource. Seneca orders practical deliberation as an examination of oneself, the proposed business, and the people for whose sake or in whose company it will be done.

Source identified27
A child who works spontaneously and for a long period of time with this material not only strengthens his reasoning powers and his character but acquires higher and clearer cognitions, which increase his mental capacity.

“A child who works spontaneously and for a long period of time with this material not only strengthens his reasoning powers and his character but acquires higher and clearer cognitions, which increase his mental capacity.”

Montessori connects sustained voluntary work with reasoning, character and intellectual development within her method, emphasizing concentrated engagement rather than passive reception.

Source details

The Montessori Elementary Material (1917), Arthur Livingston translation, Part IV, Geometry, Chapter I, “Plane Geometry,” beginning on printed page 260 and continuing onto page 261, Project Gutenberg #42869. Montessori links long spontaneous work with the geometric material to reasoning, character and higher cognitions within her method. The passage remains an early-twentieth-century pedagogical/developmental claim and is not presented as a universally established modern cognitive-effect estimate.

Source identified28
No one would have believed in the last years of the nineteenth century that this world was being watched keenly and closely by intelligences greater than man’s and yet as mortal as his own;

“No one would have believed in the last years of the nineteenth century that this world was being watched keenly and closely by intelligences greater than man’s and yet as mortal as his own;”

Wells opens by overturning ordinary human confidence and asking readers to imagine humanity itself as the observed and vulnerable species rather than the observer.

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The War of the Worlds, Book One, Chapter I, “The Eve of the War,” Project Gutenberg #36. The sentence opens the novel by establishing the retrospective Martian-invasion premise and the narrator’s contrast between human complacency and extraterrestrial scrutiny. It is speculative-fiction narration, not a factual claim that Earth was observed by Martian intelligence.

Source identified29
Every now and then a man’s mind is stretched by a new idea or sensation, and never shrinks back to its former dimensions.

“Every now and then a man’s mind is stretched by a new idea or sensation, and never shrinks back to its former dimensions.”

Voice: Authorial persona / framed maxim · The Autocrat

The Autocrat persona pictures significant ideas and experiences as permanently enlarging the range through which a person can think.

Source details

The Autocrat of the Breakfast-Table, represented by Project Gutenberg #751. The line is spoken in Holmes’s table-talk authorial persona and followed by an Alpine image; it is a literary metaphor for intellectual expansion, not a neurological claim.

Source identified30
If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts, he shall end in certainties.

“If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts, he shall end in certainties.”

Intellectual confidence can be improved by beginning with questions rather than pretending certainty too early.

Source details

The Advancement of Learning, First Book, Project Gutenberg #5500, transcribed from the 1893 Cassell & Company edition. Bacon contrasts impatience of doubt with mature suspension of judgment and then sets out two ways of contemplation before saying that beginning with certainties ends in doubts while beginning with doubts can end in certainties. It remains early-modern epistemological argument rather than a modern experimental rule for scientific method.

Source identified31
The world in which a man lives shapes itself chiefly by the way in which he looks at it, and so it proves different to different men

“The world in which a man lives shapes itself chiefly by the way in which he looks at it, and so it proves different to different men”

Schopenhauer emphasizes interpretation as a major part of lived experience: the same world can appear very different depending on the qualities and habits of the person perceiving it.

Source details

The Wisdom of Life, T. Bailey Saunders translation; Project Gutenberg #10741. The claim belongs to Schopenhauer’s philosophical account of personality and subjective experience.

Source identified32
I speak of what I scarcely understand; but the soul when thinking appears to me to be just talking—asking questions of herself and answering them, affirming and denying.
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“I speak of what I scarcely understand; but the soul when thinking appears to me to be just talking—asking questions of herself and answering them, affirming and denying.”

Voice: Dialogue speaker · Socrates

Socrates describes thought as a conversation conducted silently within oneself. He is trying out an account of judgment while discussing false opinion with Theaetetus, and even qualifies the description with an admission of uncertainty. It is a dialogue hypothesis about thinking, not a confirmed psychological theory.

Source details

Plato, Theaetetus, approximately 189e–190a; Socrates responding to Theaetetus on what it means for the mind to conceive something. Benjamin Jowett English, Project Gutenberg #1726, main dialogue after the discussion of false belief. The same passage later distinguishes inner speech from externally spoken words.

Source identified33
The future is yet to come

“The future is yet to come”

The brief phrase anchors Hazlitt’s argument that the future does not possess greater reality merely because it has not happened yet; he compares its status with the already completed past.

Source details

Table-Talk, Volume I, Essay III, “On the Past and Future,” Project Gutenberg #3020. “The future is yet to come” occurs in Hazlitt’s comparison of the already-existing past with the not-yet-existing future: the full sentence continues that the future “has never been anything.” The retained short excerpt is therefore part of a philosophical contrast, not a prediction, forecasting rule or scientific proposition.

Source identified34
Theories are the mighty soap-bubbles with which the grown-up children of science amuse themselves while the honest vulgar stand gazing in stupid admiration, and dignify these learned vagaries with the name of wisdom!

“Theories are the mighty soap-bubbles with which the grown-up children of science amuse themselves while the honest vulgar stand gazing in stupid admiration, and dignify these learned vagaries with the name of wisdom!”

Voice: Fictional narrator · Diedrich Knickerbocker

Irving’s fictional historian mocks intellectual systems that impress spectators through confidence and complexity while remaining vulnerable to later correction.

Source details

Knickerbocker's History of New York, Book I, Chapter II, Project Gutenberg #13042. Exact-witness review corrects the inherited broad Book I locator: the “mighty soap-bubbles” sentence closes the chapter’s comic survey of competing cosmogonic theories. It belongs to Diedrich Knickerbocker’s satirical pseudo-history and anti-pedantic rhetoric, not Irving rejecting science as a method.

Source identified35
There are many things which can be separated by a mental process, though they cannot be separated in fact.

“There are many things which can be separated by a mental process, though they cannot be separated in fact.”

Boethius distinguishes conceptual analysis from physical separation: the mind can consider a feature on its own even when the thing and that feature cannot actually be pulled apart in reality.

Source details

How Substances Can Be Good in Virtue of Their Existence Without Being Absolute Goods (De Hebdomadibus), H. F. Stewart / E. K. Rand 1918 edition, Project Gutenberg #13316. The sentence introduces a metaphysical method by distinguishing mental abstraction from actual separation.

Source identified36
And the peace of God, which passeth all understanding, shall keep your hearts and minds.

“And the peace of God, which passeth all understanding, shall keep your hearts and minds.”

Peace is described as guarding both thought and feeling even when circumstances are not fully explained or controlled.

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Philippians 4:7 in the King James Version; excerpt before the concluding phrase.

Source identified37
To become respectable, the exercise of their understanding is necessary; there is no other foundation for independence of character.

“To become respectable, the exercise of their understanding is necessary; there is no other foundation for independence of character.”

Independent character is presented as something built through trained understanding, not granted by status, appearance or approval.

Source details

A Vindication of the Rights of Woman; the statement immediately precedes Wollstonecraft’s insistence on reason rather than opinion as authority.

Source identified38
The mind has formed itself by a special exercise of attention, observing, comparing, and classifying.

“The mind has formed itself by a special exercise of attention, observing, comparing, and classifying.”

Montessori describes repeated acts of attention and comparison as formative intellectual practice that organizes experience instead of merely supplying memorized content.

Source details

Dr. Montessori's Own Handbook, discussion of sensory didactic material. The statement reflects Montessori’s historical theory of mental development and is not labeled as a current neuroscientific finding.

Source identified39
Yet a habit of happy thought would transform his life into harmony and beauty.

“Yet a habit of happy thought would transform his life into harmony and beauty.”

Marden’s claim reflects the book’s central period philosophy: repeated patterns of attention can alter how a person experiences ordinary life.

Source details

Cheerfulness as a Life Power; Project Gutenberg #18394. Context notes distinguish motivational rhetoric from modern psychological evidence.

Source identified40
It is a most extraordinary thing, but I never read a patent medicine advertisement without being impelled to the conclusion that I am suffering from the particular disease therein dealt with in its most virulent form.

“It is a most extraordinary thing, but I never read a patent medicine advertisement without being impelled to the conclusion that I am suffering from the particular disease therein dealt with in its most virulent form.”

Voice: Fictional narrator · J. (first-person narrator)

The narrator’s self-diagnosis escalates every advertisement into a personal medical crisis, satirizing suggestibility and the way anxious reading can turn ordinary sensations into certainty.

Source details

Three Men in a Boat, Chapter I; the narrator explains why every patent-medicine advertisement convinces him he has the advertised disease.

Source identified41
And I would ask you to be thinking of the truth and not of Socrates: agree with me, if I seem to you to be speaking the truth; or if not, withstand me might and main, that I may not deceive you as well as myself in my enthusiasm, and like the bee, leave my sting in you before I die.
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“And I would ask you to be thinking of the truth and not of Socrates: agree with me, if I seem to you to be speaking the truth; or if not, withstand me might and main, that I may not deceive you as well as myself in my enthusiasm, and like the bee, leave my sting in you before I die.”

Voice: Dialogue speaker · Socrates

Facing death, Socrates asks his friends to challenge the argument he is defending if they find it mistaken. His emphasis is on testing whether a claim is true rather than accepting it because of the speaker’s reputation, even when that speaker is himself. The appeal belongs to a debate, not a universal guarantee that his view of the soul is correct.

Source details

Phaedo, approximately Stephanus 91b–c, Socrates speaking to Simmias and Cebes after their objections to the arguments about the soul’s survival. He specifically asks them to contradict him if they think his reasoning is wrong. This is a complete sentence from Benjamin Jowett’s English translation, Project Gutenberg #1658, in the dialogue after the translator’s separate introduction. Socrates is a character and local speaker; do not attribute the sentence as a direct personal remark by Plato.

Source identified42
The scientific attitude of mind involves a sweeping away of all other desires in the interests of the desire to know—it involves suppression of hopes and fears, loves and hates, and the whole subjective emotional life, until we become subdued to the material, able to see it frankly, without preconceptions, without bias, without any wish except to see it as it is, and without any belief that what it is must be determined by some relation, positive or negative, to what we should like it to be, or to what we can easily imagine it to be.

“The scientific attitude of mind involves a sweeping away of all other desires in the interests of the desire to know—it involves suppression of hopes and fears, loves and hates, and the whole subjective emotional life, until we become subdued to the material, able to see it frankly, without preconceptions, without bias, without any wish except to see it as it is, and without any belief that what it is must be determined by some relation, positive or negative, to what we should like it to be, or to what we can easily imagine it to be.”

Inquiry becomes more reliable when the wish to know is allowed to challenge hopes, fears and preferences that would otherwise predetermine the answer.

Source details

Mysticism and Logic and Other Essays, “The Place of Science in a Liberal Education.” Russell continues by describing an attempt to see material frankly, without preconception or wishful bias.

Source identified43
Nature always wears the colors of the spirit.

“Nature always wears the colors of the spirit.”

The same surroundings can feel different according to the observer’s inner state, linking perception of nature with emotion and perspective.

Source details

Nature (first published 1836), Chapter I, “Nature,” in James Munroe and Company’s 1849 new-edition witness represented by Project Gutenberg #29433. A scan of the same 1849 J. Munroe edition places “Nature always wears the colors of the spirit” on printed page 9. Emerson is arguing that inward condition colors the experience of landscape; this is nineteenth-century Transcendentalist philosophy, not modern cognitive science, environmental psychology or a clinical claim.

Source identified44
Undoubtedly philosophers are in the right, when they tell us that nothing is great or little otherwise than by comparison.

“Undoubtedly philosophers are in the right, when they tell us that nothing is great or little otherwise than by comparison.”

Gulliver observes that judgments of size depend on a point of comparison, a lesson made vivid when his own body shifts from giant-scale in Lilliput to tiny scale in Brobdingnag.

Source details

Gulliver's Travels, Part II, Chapter I, Project Gutenberg #829. Lemuel Gulliver reflects that nothing is great or little except by comparison after finding himself tiny among the inhabitants of Brobdingnag, reversing his earlier giant-scale experience in Lilliput. This is fictional first-person satire and perspective play, not a universal philosophical proof.

Source identified45
Every man is rich or poor according to the degree in which he can afford to enjoy the necessaries, conveniencies, and amusements of human life.

“Every man is rich or poor according to the degree in which he can afford to enjoy the necessaries, conveniencies, and amusements of human life.”

Smith defines economic command in terms of access to goods and services rather than the mere possession of coins, linking wealth with purchasing capacity.

Source details

The Wealth of Nations, Book I, Chapter V; Project Gutenberg #3300. The historical spelling “conveniencies” is retained; this is classical political economy, not a modern household-wealth metric.

Source identified46
I reason, earth is short, And anguish absolute, And many hurt; But what of that?

“I reason, earth is short, And anguish absolute, And many hurt; But what of that?”

The poem begins from mortality and undeniable anguish, then presses beyond those observations by asking what explanatory or consoling conclusion can actually follow from them.

Source details

“Earth Is Short,” Poems: First Series (1890), Project Gutenberg #12242. The poem proceeds into questions about heaven and God; its religious questions remain questions rather than verified metaphysical claims.

Source identified47
a man may have a great mass of knowledge, but if he has not worked it up by thinking it over for himself, it has much less value than a far smaller amount which he has thoroughly pondered.

“a man may have a great mass of knowledge, but if he has not worked it up by thinking it over for himself, it has much less value than a far smaller amount which he has thoroughly pondered.”

Accumulated information is distinguished from understanding: Schopenhauer values knowledge that has been actively compared, connected and reconsidered over a larger but unprocessed store.

Source details

The Art of Literature, section “On Thinking for Oneself,” T. Bailey Saunders translation; Project Gutenberg #10714. The library analogy immediately precedes the sentence.

Source identified49
Am I not right in maintaining that a good education is that which tends most to the improvement of mind and body?
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“Am I not right in maintaining that a good education is that which tends most to the improvement of mind and body?”

Voice: Dialogue speaker · Athenian Stranger

The speaker asks whether education should develop mental as well as bodily capacities. In the dialogue this opens a discussion of early nurture, training and the proposed legal order.

Source details

Laws, Book VII, Benjamin Jowett English translation. The Athenian Stranger asks Cleinias this question as they begin discussing how children should be raised; it is dialogue, not a detached modern prescription for health or schooling.

Source identified50
What is now proved was once only imagined.

“What is now proved was once only imagined.”

Blake’s proverb compresses a recurring imaginative pattern: possibilities can exist first as conceived ideas before later work, discovery or demonstration makes some of them real or provable.

Source details

The Marriage of Heaven and Hell, “Proverbs of Hell,” represented by Project Gutenberg #45315 at printed page 16. Gutenberg regularizes the line to “imagined”; Blake’s engraved text is often transcribed with historical spelling and punctuation. The proverb is part of Blake’s deliberately paradoxical infernal-wisdom sequence, not a literal claim that every imagined thing will eventually be proved.

Topic guide

A quick guide to mind

Philosophical quotations are useful when they open a question rather than close it. A short line about truth, freedom, time, or meaning usually belongs to a larger argument.

Reading lenses

Thought and perceptionBelief and judgmentAttention and interpretationImagination and perspective

How to use this page

Treat each quotation as an entry point. Compare authors, inspect the named source, and notice where two memorable lines offer incompatible answers to the same question.

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These routes are drawn from the quotations loaded on this page and are meant as starting points, not extra topic labels.

Short & memorable

Concise lines for readers who want the core idea without a long passage.

  1. “My subject was mental efficiency as a means to self-development.” — Arnold Bennett · Mental Efficiency, and Other Hints to Men and Women
  2. “Satire is of the nature of moral philosophy, as being instructive;” — John Dryden · A Discourse Concerning the Original and Progress of Satire
  3. “Twice two makes five is sometimes a very charming thing too.” — Fyodor Dostoevsky · Notes from Underground
  4. “Curiosity is one of the most permanent and certain characteristics of a vigorous intellect.” — Samuel Johnson · The Rambler
  5. “He who knows only his own side of the case, knows little of that.” — John Stuart Mill · On Liberty

Reflective & philosophical

Quotations connected with deeper interpretation, perspective, philosophy, or sustained thought.

  1. “When you have eliminated the impossible whatever remains, however improbable, must be the truth.” — Arthur Conan Doyle · The Sign of the Four
  2. “And this is why knowledge is more honourable and excellent than true opinion, because…” — Plato · Meno
  3. “And yet, O my friend, if true opinion in law courts and knowledge are…” — Plato · Theaetetus
  4. “Satire is of the nature of moral philosophy, as being instructive;” — John Dryden · A Discourse Concerning the Original and Progress of Satire
  5. “And thought is best when the mind is gathered into herself and none of…” — Plato · Phaedo

Practical & action-oriented

Lines connected with action, discipline, effort, habits, work, or perseverance.

  1. “My subject was mental efficiency as a means to self-development.” — Arnold Bennett · Mental Efficiency, and Other Hints to Men and Women
  2. “If a man's thoughts are not dissipated, if his mind is not perplexed, if…” — The Dhammapada · The Dhammapada
  3. “The mind that is disciplined by Purity and fortified by Wisdom, avoids all those…” — James Allen · Out from the Heart
  4. “The mind has formed itself by a special exercise of attention, observing, comparing, and…” — Maria Montessori · Dr. Montessori's Own Handbook
  5. “Yet a habit of happy thought would transform his life into harmony and beauty.” — Orison Swett Marden · Cheerfulness as a Life Power

Earlier sources

Older works represented in the collection, useful for comparing how the topic changes across time.

  1. “When you have eliminated the impossible whatever remains, however improbable, must be the truth.” — Arthur Conan Doyle · The Sign of the Four
  2. “And this is why knowledge is more honourable and excellent than true opinion, because…” — Plato · Meno
  3. “And yet, O my friend, if true opinion in law courts and knowledge are…” — Plato · Theaetetus
  4. “Satire is of the nature of moral philosophy, as being instructive;” — John Dryden · A Discourse Concerning the Original and Progress of Satire
  5. “And thought is best when the mind is gathered into herself and none of…” — Plato · Phaedo
Browse by length

Choose how much context you want

The complete 289-quote collection includes several reading lengths. Pick a depth, or ignore length and keep browsing normally.

189

Quick scan

Concise quotations for comparing wording and emphasis quickly.

87

More context

Medium-length quotations that give the idea more room to develop.

13

Longer passages

Useful when qualification, narrative setting or a fuller argument matters.

Suggested routeStart with concise lines for range, move to medium-length quotations for more context, and use longer passages when the idea needs fuller development.

289 quotations total. The page loads a smaller initial browse set for speed; search covers the complete collection and Load more continues in collection order.

Key distinctions

Three useful distinctions in this collection

Short quotations can sound more absolute than the larger source argument. These prompts help preserve useful distinctions while browsing mind.

Useful contrasts

  • thought and perception versus belief and judgment
  • attention and interpretation versus imagination and perspective
  • a memorable line versus the fuller argument found in its source context

Where a short line can mislead

Compression can make philosophy sound more certain than the source really is. The meaning notes therefore explain the immediate idea without pretending to summarize an entire philosophy.

These are editorial reading prompts for the topic as a whole, not automatic labels applied to every quotation or inferred only from the initial browse set.

Across time

Where these mind quotations sit historically

Era totals use the complete source-backed topic, not only the quotations loaded in the browse grid.

Source eras

  • Ancient / classical25 quotations
  • Ancient / medieval21 quotations
  • 1500s–1600s29 quotations
  • 1700s37 quotations
  • 1800s96 quotations
  • 1900s and later71 quotations
  • Undated / traditional10 quotations
Compare voices

How different writers approach mind

Each example comes from that writer’s complete source-backed intersection with this topic, not only from the quotations loaded above.

Authors and sources

Who speaks here, and which works are represented?