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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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“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 note: Human, All-Too-Human, Part I, aphorism 578, “Partial Knowledge”; Helen Zimmern translation; sentence shortened before the final clause about popularity and persuasion.
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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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“Theories thus become instruments, not answers to enigmas, in which we can rest.”
James describes theories as tools for moving inquiry and experience forward rather than final intellectual resting places that eliminate the need for further testing or revision.
Source note: Pragmatism, Lecture II, “What Pragmatism Means”; Project Gutenberg #5116. Capitalization has been normalized from the represented all-caps sentence while the wording is otherwise preserved.
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“Our business here is not to know all things, but those which concern our conduct.”
Locke places useful limits around intellectual ambition: human inquiry need not comprehend everything in order to guide life well, and knowing where understanding stops is part of using it responsibly.
Source note: An Essay Concerning Humane Understanding, Book I, Chapter I, section 6, Project Gutenberg #10615.
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“Pragmatism unstiffens all our theories, limbers them up and sets each one at work.”
James presents pragmatism as a method that makes theories answer to practical consequences and experience instead of allowing abstract formulations to remain rigid and self-sufficient.
Source note: Pragmatism, Lecture II, “What Pragmatism Means”; Project Gutenberg #5116. The sentence follows James’s claim that theories become instruments rather than final answers.