Meaning of “The fool who knows his foolishness, is wise…”

Aristotle, Metaphysics, Book I, Chapter I, W. D. Ross translation (1908), validated Wikisource scan leaf 21. 'All men by nature desire to know' opens the work before the discussion of sensation, memory, experience, art and knowledge. This remains ancient philosophy mediated by translation, not a modern empirical finding about cognition.

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

As You Like It, Act V, Scene 1, Touchstone; 1919 Yale Shakespeare edition edited by Jack R. Crawford, printed page 89 / Wikisource scan leaf 101. Touchstone says, “The fool doth think he is wise, but the wise man knows himself to be a fool,” while verbally outmaneuvering William in a comic exchange over Audrey. The maxim remains fictional comic dialogue rather than a direct Shakespearean self-help proposition.

Analects 2:15 in James Legge’s translation; the saying balances study with independent reflection.

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.

The Vanity of Human Wishes (1749), first-edition scholar passage, Wikisource scan leaf 28. “And pause awhile from Learning to be wise” turns from the ambitious student’s pursuit of knowledge toward Johnson’s satirical warning that learning does not by itself remove grief, danger or error. This is eighteenth-century moral-satirical poetry after Juvenal, not a modern educational rule.