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Knowledge quotes

Explore Knowledge quotations through curiosity and questions, practice, error, and feedback, knowledge joined with judgment. Compare how different writers frame the idea across distinct works and periods.

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Source identified1
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 identified2
For herein is the evil of ignorance, that he who is neither good nor wise is nevertheless satisfied with himself: he has no desire for that of which he feels no want.

“For herein is the evil of ignorance, that he who is neither good nor wise is nevertheless satisfied with himself: he has no desire for that of which he feels no want.”

Voice: Reported speaker · Diotima, recounted by Socrates

Ignorance becomes difficult to correct when a person feels no lack in understanding, because satisfaction with one’s present judgment removes the motivation to seek what is missing.

Source details

Symposium, Socrates recounting Diotima’s teaching, Benjamin Jowett translation, Project Gutenberg #1600. Diotima is a reported speaker within the dialogue; the passage is philosophical argument about ignorance and desire for wisdom.

Source identified3
Reading is thinking with some one else's head instead of one's own.

“Reading is thinking with some one else's head instead of one's own.”

Reading supplies another mind’s thought, but Schopenhauer warns that consuming ideas should not replace the work of forming one’s own connected judgment.

Source details

Essay “On Books and Reading,” in a public-domain English collection of Schopenhauer’s essays.

Source identified4
Read not to contradict and confute; nor to believe and take for granted; nor to find talk and discourse; but to weigh and consider.

“Read not to contradict and confute; nor to believe and take for granted; nor to find talk and discourse; but to weigh and consider.”

Bacon describes reading as active judgment rather than passive agreement or reflexive opposition, making careful consideration the central habit of serious study.

Source details

Of Studies, in Bacon’s instructions for how different kinds of books should be read.

Source identified5
Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler than they are.

“Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler than they are.”

The warning is that simplified partial explanations can spread more easily precisely because they remove the complications that fuller understanding would have to preserve.

Source details

Human, All-Too-Human, Part I, aphorism 578, “Partial Knowledge”; Helen Zimmern translation; sentence shortened before the final clause about popularity and persuasion.

Source identified6
Opinion appears to you to be darker than knowledge, but lighter than ignorance?

“Opinion appears to you to be darker than knowledge, but lighter than ignorance?”

Voice: Dialogue speaker · Socrates

Opinion is treated as an intermediate state: it is not complete ignorance, but it also lacks the clarity and stability of knowledge.

Source details

The Republic, Book V; Socrates places opinion between knowledge and ignorance in the argument about what each apprehends.

Source identified7
Knowledge is power.

“Knowledge is power.”

The maxim connects understanding with the capacity to act effectively rather than treating knowledge as decoration.

Source details

From the Latin “ipsa scientia potestas est”; common English rendering.

Source identified8
Hence more than half their disputes are at bottom verbal.

“Hence more than half their disputes are at bottom verbal.”

Lewes argues that many apparent disagreements persist because people use the same terms with different meanings, making precision of language part of clearer reasoning.

Source details

The Physical Basis of Mind, chapter on consciousness and unconsciousness; Project Gutenberg #60212. Lewes is discussing ambiguity of scientific terms, so the line supports communication and conceptual clarity rather than a claim that all disputes are merely verbal.

Source identified9
All that Mankind has done, thought, gained or been: it is lying as in magic preservation in the pages of Books.

“All that Mankind has done, thought, gained or been: it is lying as in magic preservation in the pages of Books.”

Books preserve human experience beyond individual lifetimes, allowing later readers to encounter accumulated thought, achievement, conflict, and memory.

Source details

On Heroes, Hero-Worship, and the Heroic in History; Carlyle describes books as durable containers of human memory and achievement.

Source identified10
Wise people, after they have listened to the laws, become serene, like a deep, smooth, and still lake.

“Wise people, after they have listened to the laws, become serene, like a deep, smooth, and still lake.”

The still-lake image links serenity with disciplined understanding: calm is portrayed not as blankness but as a settled mind shaped by hearing and absorbing the teaching.

Source details

Dhammapada 82, F. Max Müller translation, Project Gutenberg #2017. The verse belongs to a Buddhist canonical collection and remains a textual source voice rather than a quotation by a modern individual author.

Source identified11
But ask now the beasts, and they shall teach thee; and the fowls of the air, and they shall tell thee:

“But ask now the beasts, and they shall teach thee; and the fowls of the air, and they shall tell thee:”

Job points toward animals and birds as objects of instruction, suggesting that observation of living nature can challenge narrow human assumptions.

Source details

Job 12:7, King James Version; Job appeals to creatures and the earth as witnesses within his argument about divine power and human understanding.

Source identified12
The function of the university is not simply to teach bread-winning, or to furnish teachers for the public schools or to be a centre of polite society; it is, above all, to be the organ of that fine adjustment between real life and the growing knowledge of life, an adjustment which forms the secret of civilization.

“The function of the university is not simply to teach bread-winning, or to furnish teachers for the public schools or to be a centre of polite society; it is, above all, to be the organ of that fine adjustment between real life and the growing knowledge of life, an adjustment which forms the secret of civilization.”

Higher education has purposes beyond immediate earning because Du Bois sees it as connecting growing knowledge with the larger demands and meaning of real life.

Source details

The Souls of Black Folk, “Of the Training of Black Men.” This is the opening clause of a longer sentence in which Du Bois describes the university as an organ connecting real life with growing knowledge of life.

Source identified13
Knowledge which is acquired under compulsion obtains no hold on the mind.

“Knowledge which is acquired under compulsion obtains no hold on the mind.”

Voice: Dialogue speaker · Socrates

Learning forced without engagement may fail to become durable understanding because the learner has not made the knowledge intellectually their own.

Source details

The Republic, Book VII, Jowett translation; Socrates argues that education should draw the mind rather than rely only on compulsion.

Source identified15
He who destroys a good book, kills reason itself.

“He who destroys a good book, kills reason itself.”

The dramatic comparison argues that suppressing a worthy book destroys access to reasoning and accumulated human thought, not merely paper and ink.

Source details

Areopagitica; excerpt from Milton’s comparison between killing a person and destroying a good book.

Source identified16
To know and yet (think) we do not know is the highest (attainment); not to know (and yet think) we do know is a disease.

“To know and yet (think) we do not know is the highest (attainment); not to know (and yet think) we do know is a disease.”

The chapter values an awareness of the limits of knowledge and treats false certainty as a disorder of judgment, making intellectual humility a form of protection against confident ignorance.

Source details

Tao Teh King, Chapter 71, James Legge translation, Project Gutenberg #216.

Source identified17
Some books are to be tasted, others to be swallowed, and some few to be chewed and digested.

“Some books are to be tasted, others to be swallowed, and some few to be chewed and digested.”

Not every book deserves the same kind of attention; readers should match effort and depth to the value and purpose of the work.

Source details

Essay “Of Studies”; Bacon distinguishes different depths and purposes of reading.

Source identified18
Ignorance more frequently begets confidence than does knowledge.

“Ignorance more frequently begets confidence than does knowledge.”

Darwin warns that limited knowledge can make sweeping certainty easier, while deeper inquiry often exposes how much remains unresolved.

Source details

The Descent of Man, and Selection in Relation to Sex, Introduction, represented by Project Gutenberg #2300. Darwin writes that 'ignorance more frequently begets confidence than does knowledge' while rejecting confident claims that human origins could never be solved by science. The frozen quotation capitalizes the clause as a standalone sentence although it appears after a colon in the witness; it remains a historical scientific argument, not a universal quantitative law about confidence.

Source identified19
One can never read too little of bad, or too much of good books: bad books are intellectual poison; they destroy the mind.

“One can never read too little of bad, or too much of good books: bad books are intellectual poison; they destroy the mind.”

The deliberately severe contrast argues that reading quality matters because repeated exposure influences the habits and material of thought.

Source details

Essay “On Books and Reading,” public-domain English text.

Source identified20
We know all about the habits of the ant, we know all about the habits of the bee, but we know nothing at all about the habits of the oyster. It seems almost certain that we have been choosing the wrong time for studying the oyster.

“We know all about the habits of the ant, we know all about the habits of the bee, but we know nothing at all about the habits of the oyster. It seems almost certain that we have been choosing the wrong time for studying the oyster.”

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

The joke pretends the lack of visible oyster behavior is a scheduling problem, parodying confident explanations and turning observation itself into the object of humor.

Source details

Pudd’nhead Wilson, Calendar epigraph paired with the starving-dog comparison.

Source identified21
Reading maketh a full man; conference a ready man; and writing an exact man.

“Reading maketh a full man; conference a ready man; and writing an exact man.”

Bacon distinguishes what reading, conversation, and writing each contribute to intellectual development.

Source details

Of Studies; Bacon distinguishes the intellectual uses of reading, conversation, and writing within the essay’s compact account of study and judgment.

Source identified22
We hear only the questions to which we are capable of finding an answer.

“We hear only the questions to which we are capable of finding an answer.”

The aphorism suggests that inquiry is limited by the conceptual capacities of the person asking, making intellectual growth partly a matter of becoming able to formulate and recognize better questions.

Source details

The Joyful Wisdom, aphorism 196; Thomas Common translation.

Source identified23
Knowledge comes, but wisdom lingers.

“Knowledge comes, but wisdom lingers.”

Facts can be acquired quickly, while judgment develops more slowly through reflection and experience.

Source details

Poem “Locksley Hall”; the contrast distinguishes readily acquired knowledge from the slower development of judgment and wisdom.

Source identified24
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 identified25
Education, n. That which discloses to the wise and disguises from the foolish their lack of understanding.

“Education, n. That which discloses to the wise and disguises from the foolish their lack of understanding.”

Bierce’s satirical definition suggests that learning may deepen understanding in reflective people while giving the unreflective additional ways to conceal ignorance.

Source details

The Devil’s Dictionary, entry “Education,” Project Gutenberg #972. This is a deliberately cynical comic dictionary definition and should be read as satire rather than as a literal educational theory.

Source identified26
Experience is primarily an active-passive affair; it is not primarily cognitive.

“Experience is primarily an active-passive affair; it is not primarily cognitive.”

Dewey treats experience as a combination of doing and undergoing consequences, with understanding developing through the relationship between action and what follows from it.

Source details

Democracy and Education (1916), Chapter XI, “Experience and Thinking.” Dewey describes experience as a relation between doing and undergoing consequences, then immediately qualifies the active-passive formulation by saying that valuable experience includes cognition insofar as relationships and continuities are perceived. Verified against Project Gutenberg #852 and the scan-backed Wikisource Chapter XI transcription. The sentence is not a denial that cognition matters and is not presented as modern neuroscientific evidence.

Source identified27
If I have seen farther, it is by standing on the shoulders of giants.

“If I have seen farther, it is by standing on the shoulders of giants.”

Newton credits earlier and contemporary intellectual work as part of what made his own advances possible, framing discovery as cumulative rather than wholly solitary.

Source details

Newton to Robert Hooke, Cambridge, February 5, 1675/76, represented by the Newton Project normalized transcription. The historical letter uses older spelling; this record follows the project’s normalized “farther” and “shoulders of giants” wording.

Source identified28
The greatness and the minuteness of nature pass all understanding.

“The greatness and the minuteness of nature pass all understanding.”

Burroughs emphasizes that nature can astonish at both immense and tiny scales, leaving observation capable of deepening wonder rather than exhausting it.

Source details

Wake-Robin; Burroughs reflects on close observation of natural life and the limits of easy comprehension.

Source identified29
no single instrument of youthful education has such mighty power ... as the study of arithmetic.
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“no single instrument of youthful education has such mighty power ... as the study of arithmetic.”

Voice: Dialogue speaker · Athenian Stranger

The Athenian Stranger praises arithmetic as a tool for developing practical and civic judgment. The abbreviated extract presents a philosophical claim about training, not a measured comparison of school subjects.

Source details

Laws, Book V, Benjamin Jowett English translation. Explicit excerpt: an ellipsis omits the intervening phrase about domestic economy, politics and the arts; the surrounding passage praises arithmetic while warning against separating skill from moral aims.

Source identified30
Where there is much desire to learn, there of necessity will be much arguing, much writing, many opinions.

“Where there is much desire to learn, there of necessity will be much arguing, much writing, many opinions.”

Milton treats disagreement as a natural consequence of serious learning: intellectual activity produces competing arguments because knowledge is still being worked out.

Source details

Areopagitica, in Milton’s defense of a city actively reading, discussing, and testing ideas.

Source identified31
If you know the enemy and know yourself, you need not fear the result of a hundred battles.

“If you know the enemy and know yourself, you need not fear the result of a hundred battles.”

Accurate understanding of both one’s own capabilities and the opposing side reduces avoidable strategic surprise and miscalculation.

Source details

The Art of War, Chapter III “Attack by Stratagem,” section 18, Lionel Giles translation (1910), beginning on printed page 24 / scan leaf 80 and continuing onto printed page 25 / scan leaf 81 in the original Giles edition on Wikisource, cross-checked against Project Gutenberg #17405. The enemy/self-knowledge sentence closes Chapter III’s discussion of conditions for victory and remains translation-mediated military strategy rather than a modern psychological or self-help claim.

Source identified32
Knowledge is hard to seek, and harder yet to adhere to. Knowledge is painful often; and yet when we know we are happy.

“Knowledge is hard to seek, and harder yet to adhere to. Knowledge is painful often; and yet when we know we are happy.”

Voice: Fictional character · Claude

Claude presents knowledge as difficult to obtain and live with, yet still capable of giving a kind of clarity or satisfaction once it is possessed.

Source details

Amours de Voyage, Letter X, “Claude to Eustace,—from Rome,” Project Gutenberg #1393. Claude’s two sentences about knowledge appear in the fictional verse-letter sequence after he turns from Roman politics toward study. This is Clough’s fictional epistolary voice, not direct autobiography or an empirical claim about happiness.

Source identified33
I frame no hypotheses; for whatever is not deduced from the phenomena is to be called an hypothesis.

“I frame no hypotheses; for whatever is not deduced from the phenomena is to be called an hypothesis.”

Newton distinguishes conclusions inferred from observed phenomena from explanations he regards as unsupported speculation within the methodological argument of the General Scholium.

Source details

Philosophiæ Naturalis Principia Mathematica, General Scholium, added to the second edition in 1713; represented by the 1846 Andrew Motte English translation on Wikisource. “I frame no hypotheses” is kept inside Newton’s specific discussion of gravity and experimental philosophy rather than treated as a blanket prohibition on hypotheses in modern science.

Source identified34
Happy is the man that findeth wisdom, and the man that getteth understanding.

“Happy is the man that findeth wisdom, and the man that getteth understanding.”

Happiness is connected with gaining wisdom and understanding, suggesting that a good life depends on discernment as well as circumstance.

Source details

Proverbs 3:13 in the King James Version; the verse begins a passage praising the value of wisdom.

Source identified35
There is then creative reading as well as creative writing.

“There is then creative reading as well as creative writing.”

Reading can be an active intellectual act when the reader interprets, connects, questions, and produces new understanding rather than merely receiving words passively.

Source details

The American Scholar; Emerson argues that books should awaken independent thought rather than replace it.

Source identified36
The Analytical Engine has no pretensions whatever to originate anything. It can do whatever we know how to order it to perform.

“The Analytical Engine has no pretensions whatever to originate anything. It can do whatever we know how to order it to perform.”

Lovelace cautions readers not to attribute independent origination to Babbage’s proposed machine, distinguishing programmed operations from the human knowledge used to specify them.

Source details

Ada Lovelace, Note G to her 1843 translation of Luigi Menabrea’s “Sketch of the Analytical Engine Invented by Charles Babbage.” The claim concerns the proposed Analytical Engine in its historical design context and is not generalized into a factual limit on modern AI systems.

Source identified37
Science, as we often say, is the systematization of Experience under the forms of ideal constructions.

“Science, as we often say, is the systematization of Experience under the forms of ideal constructions.”

Lewes describes science as organized experience shaped into conceptual structures, a historical philosophy-of-science claim about how observation becomes systematic knowledge.

Source details

The Physical Basis of Mind, Problem I, “The Study of Psychology,” in the discussion of modern scientific method; Project Gutenberg #60212. The wording belongs to Lewes’s 1877 framework, not current philosophy-of-science consensus.

Source identified38
Are not gross Bodies and Light convertible into one another, and may not Bodies receive much of their Activity from the Particles of Light which enter their Composition?

“Are not gross Bodies and Light convertible into one another, and may not Bodies receive much of their Activity from the Particles of Light which enter their Composition?”

Newton poses a speculative question about relationships between matter and light, illustrating how the later Queries of Opticks use open questions to push beyond the book’s demonstrated optical results.

Source details

Opticks, Query 30, represented from the fourth corrected edition text (1730) by Inters.org. Newton states this as a question within his historical natural-philosophy speculation; it is not presented as a modern account of particle physics or matter–energy conversion.

Source identified39
The fool who knows his foolishness, is wise at least so far. But a fool who thinks himself wise, he is called a fool indeed.

“The fool who knows his foolishness, is wise at least so far. But a fool who thinks himself wise, he is called a fool indeed.”

The verse treats recognition of one’s own foolishness as the beginning of wisdom, while self-certainty without understanding becomes a deeper form of ignorance.

Source details

Dhammapada 63, Chapter V, “The Fool,” F. Max Müller translation, Project Gutenberg #2017. The verse belongs to a Buddhist canonical collection and remains a textual source voice rather than a modern individual-author quotation.

Source identified40
Let her and Falsehood grapple; who ever knew Truth put to the worse, in a free and open encounter?

“Let her and Falsehood grapple; who ever knew Truth put to the worse, in a free and open encounter?”

Milton argues that confidence in truth should make room for open contest rather than prior censorship: ideas gain strength by being tested publicly against what may be false.

Source details

Areopagitica, Project Gutenberg #608. The sentence appears in Milton’s argument against licensing and prior restraint on printing. It is a defense of open intellectual encounter, not a claim that every expression is harmless or beyond later judgment.

Source identified41
A little learning is a dangerous thing.

“A little learning is a dangerous thing.”

Partial knowledge can produce misplaced confidence; the warning favors deeper study over shallow certainty.

Source details

An Essay on Criticism, Part II; Pope warns that shallow learning can produce premature confidence before deeper study tempers judgment.

Source identified42
It must never exist alone—never for itself; it exists rightly only when it is the means of knowledge, or the grace of agency for life.

“It must never exist alone—never for itself; it exists rightly only when it is the means of knowledge, or the grace of agency for life.”

Art is framed as serving knowledge or enriching useful human activity, locating creative work inside a larger relationship with understanding and lived use.

Source details

Lectures on Art, Lecture IV, Project Gutenberg #19164. Ruskin’s anti-autonomist theory of art is retained as his position rather than a universal definition.

Source identified43
The world is my idea.

“The world is my idea.”

Schopenhauer opens his system by arguing that the experienced world is always presented in relation to a knowing subject, making perception and consciousness conditions of the world as it is known.

Source details

The World as Will and Idea, Vol. I, First Book, §1, Haldane and Kemp translation, Project Gutenberg #38427. “Idea” translates Vorstellung in this historical philosophical vocabulary and should not be read as the everyday sense of a passing thought.

Source identified44
If the principle of final causes were a first principle, and a priori, like the principle of causality, we would apply it everywhere and in all circumstances; but it is not so.

“If the principle of final causes were a first principle, and a priori, like the principle of causality, we would apply it everywhere and in all circumstances; but it is not so.”

Janet begins by denying that teleological explanation functions as an automatic first principle, making its use something that must itself be examined and justified.

Source details

Final Causes, Book I, Chapter I, “The Principle,” opening sentence, William Affleck translation (1878). The represented public-domain scan prints the sentence on p. 17 after Robert Flint’s prefatory matter. Janet begins by denying that finality functions as an automatic a priori principle like causality; this remains nineteenth-century philosophical teleology rather than current scientific consensus.

Source identified45
They know Earth-secrets that know not I.

“They know Earth-secrets that know not I.”

The speaker ends by conceding that the small creatures may possess forms of earthly knowledge unavailable to him, turning observation into intellectual humility.

Source details

“An August Midnight,” Project Gutenberg #3168. The line is poetic speculation about nonhuman knowledge rather than a scientific claim about insect cognition.

Source identified46
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 identified47
Curiosity in children is but an appetite after knowledge; and therefore ought to be encouraged in them.

“Curiosity in children is but an appetite after knowledge; and therefore ought to be encouraged in them.”

Locke treats curiosity as a natural drive toward knowledge and argues that education should protect and guide it rather than shame sincere questions.

Source details

Some Thoughts Concerning Education, Part VIII, section 118. Locke calls children's curiosity an appetite after knowledge and gives practical directions for encouraging questions. The passage remains seventeenth-century educational/parenting counsel rather than contemporary developmental-science or guaranteed learning-outcome evidence.

Source identified48
A rational mind will be employ’d, it will never be satisfy’d in doing nothing, and if you neglect to furnish it with good materials, ’tis like to take up with such as come to hand.

“A rational mind will be employ’d, it will never be satisfy’d in doing nothing, and if you neglect to furnish it with good materials, ’tis like to take up with such as come to hand.”

Voice: Authorial / signed preface voice · Mary Astell

Astell argues that the mind naturally seeks occupation, so denying people serious intellectual material does not make the mind inactive; it leaves it to whatever material happens to be available.

Source details

A Serious Proposal to the Ladies, Part I, printed page 56 in the represented 1697 two-part edition, Project Gutenberg #54984. Astell writes that a rational mind will be employed while arguing that women denied serious intellectual education may be driven toward inferior materials. Original spelling is retained; the passage belongs to her explicitly religious and educational proposal, not contemporary educational-outcome research.

Source identified49
the sum of knowledge for all of us.

“the sum of knowledge for all of us.”

Carlyle says understanding the present includes asking what the present situation requires people to do, joining interpretation of one’s time with practical judgment.

Source details

Latter-Day Pamphlets, No. I “The Present Time”; Project Gutenberg #1140. The excerpt completes Carlyle’s sentence about knowing the present time and what it bids people do; the local political context remains essential.

Source identified50
Reading is to the mind what exercise is to the body.

“Reading is to the mind what exercise is to the body.”

Regular reading is compared with physical exercise because repeated intellectual use can strengthen attention, knowledge, and mental capacity over time.

Source details

The Tatler No. 147; the comparison presents reading as a form of regular exercise for the mind.

Topic guide

A quick guide to knowledge

Learning and creative quotations often disagree productively about study, experience, imagination, discipline, and the role of mistakes.

Reading lenses

Curiosity and questionsPractice, error, and feedbackKnowledge joined with judgmentImagination, craft, and expression

How to use this page

Compare what each source thinks knowledge is for. Some lines emphasize reading and teaching; others emphasize practice, doubt, observation, or making something new.

Choose the lens that matches what you are looking for, then open a quotation for its source and context.

Browse by reading angle

Choose a way into these knowledge quotes

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. “Reading is thinking with some one else's head instead of one's own.” — Arthur Schopenhauer · Essays of Schopenhauer — On Books and Reading
  2. “Opinion appears to you to be darker than knowledge, but lighter than ignorance?” — Plato · The Republic
  3. “Knowledge is power.” — Francis Bacon · Meditationes Sacrae
  4. “Hence more than half their disputes are at bottom verbal.” — George Henry Lewes · The Physical Basis of Mind
  5. “Knowledge which is acquired under compulsion obtains no hold on the mind.” — Plato · The Republic

Reflective & philosophical

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

  1. “And yet, O my friend, if true opinion in law courts and knowledge are…” — Plato · Theaetetus
  2. “For herein is the evil of ignorance, that he who is neither good nor…” — Plato · Symposium
  3. “Reading is thinking with some one else's head instead of one's own.” — Arthur Schopenhauer · Essays of Schopenhauer — On Books and Reading
  4. “Read not to contradict and confute; nor to believe and take for granted; nor…” — Francis Bacon · Of Studies
  5. “Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler…” — Friedrich Nietzsche · Human, All-Too-Human

Practical & action-oriented

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

  1. “One can never read too little of bad, or too much of good books:…” — Arthur Schopenhauer · Essays of Schopenhauer — On Books and Reading
  2. “We know all about the habits of the ant, we know all about the…” — Mark Twain · Pudd’nhead Wilson’s Calendar
  3. “Experience is primarily an active-passive affair; it is not primarily cognitive.” — John Dewey · Democracy and Education
  4. “Reading is to the mind what exercise is to the body.” — Richard Steele · The Tatler No. 147

Earlier sources

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

  1. “And yet, O my friend, if true opinion in law courts and knowledge are…” — Plato · Theaetetus
  2. “For herein is the evil of ignorance, that he who is neither good nor…” — Plato · Symposium
  3. “Reading is thinking with some one else's head instead of one's own.” — Arthur Schopenhauer · Essays of Schopenhauer — On Books and Reading
  4. “Read not to contradict and confute; nor to believe and take for granted; nor…” — Francis Bacon · Of Studies
  5. “Opinion appears to you to be darker than knowledge, but lighter than ignorance?” — Plato · The Republic
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 knowledge.

Useful contrasts

  • curiosity and questions versus practice, error, and feedback
  • knowledge joined with judgment versus imagination, craft, and expression
  • a memorable line versus the fuller argument found in its source context

Where a short line can mislead

A clever sentence is not evidence by itself. Source context matters especially on topics about knowledge, because memorable wording can oversimplify a more careful argument.

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 knowledge quotations sit historically

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

Source eras

  • Ancient / classical10 quotations
  • Ancient / medieval2 quotations
  • 1500s–1600s18 quotations
  • 1700s7 quotations
  • 1800s28 quotations
  • 1900s and later12 quotations
  • Undated / traditional3 quotations
Compare voices

How different writers approach knowledge

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?