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“The old believe everything: the middle-aged suspect everything: the young know everything.”
The epigram compresses three stereotypes of certainty into one balanced joke, mocking credulity, suspicion, and youthful overconfidence at once.
Source note: “Phrases and Philosophies for the Use of the Young,” first published in The Chameleon in 1894.
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“The unexamined life is not worth living.”
Voice: Dialogue speaker · Socrates
Socrates links a worthwhile human life with reflection on beliefs, conduct, and reasons rather than unexamined routine.
Source note: Apology 38a; wording varies by translation.
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“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 note: On Liberty, Chapter 2; Mill argues for open discussion because opposing views expose weaknesses and sharpen understanding.
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“All men by nature desire to know.”
Aristotle treats the desire for knowledge as a basic human tendency, giving curiosity a foundational place in the movement from perception toward understanding.
Source note: Metaphysics, Book I, chapter 1, W. D. Ross translation; the work opens with this claim before discussing sensation, memory, experience, art, and knowledge.
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“And pause awhile from Learning to be wise;”
Johnson distinguishes accumulating learning from exercising judgment, asking the scholar to interrupt pursuit of knowledge long enough to examine what wisdom requires.
Source note: The Vanity of Human Wishes (1749), Johnson’s imitation of Juvenal’s Tenth Satire; the line introduces a section on the hazards and disappointments surrounding learned ambition.
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“We must know the truth; and we must avoid error.”
James separates two intellectual duties—seeking truth and avoiding falsehood—to show that prioritizing one over the other can produce different habits of belief and inquiry.
Source note: The Will to Believe, essay “The Will to Believe”; Project Gutenberg #26659. James immediately argues that truth-seeking and error-avoidance are distinct laws rather than two phrasings of one command.