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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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“The universe is wider than our views of it.”
Reality exceeds any one viewpoint, so confidence in a perspective should leave room for what has not yet been seen.
Source note: Walden, Conclusion; Thoreau uses the sentence while arguing that familiar human views do not exhaust reality.
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“The devil can cite Scripture for his purpose.”
Voice: Fictional character · Antonio
Even respected language can be quoted selectively, so a citation should be judged by context and purpose rather than authority alone.
Source note: The Merchant of Venice, Act 1, Scene 3.
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“Regard him as loyal, and you will make him loyal.”
Seneca suggests that suspicion can become self-reinforcing: treating a chosen friend as trustworthy helps create the conditions for candid, reciprocal friendship rather than teaching defensiveness from the outset.
Source note: Moral Letters to Lucilius, Letter 3, Richard M. Gummere translation. Seneca immediately contrasts this with people who fear deception so strongly that their suspicions help teach others to deceive them.
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“A liar will not be believed, even when he speaks the truth.”
Voice: Fictional character · Wise man of the village
Repeated deception damages credibility beyond the original lie: once listeners have learned to expect false alarms, even a later truthful warning can fail to restore belief in time.
Source note: Joseph Jacobs, The Fables of Aesop, “The Shepherd Boy and the Wolf,” Project Gutenberg #28. The wise man of the village gives the moral after the boy’s repeated false cries cause the villagers to ignore his real warning.
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“A long habit of not thinking a thing wrong, gives it a superficial appearance of being right.”
Custom can disguise error by making the familiar feel legitimate; critical judgment requires re-examining practices that have escaped scrutiny through repetition.
Source note: Common Sense, Introduction; Paine uses the observation to explain the resistance that unfamiliar political arguments may initially provoke.