“Real knowledge is to know the extent of one's ignorance.”

— Confucius

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Confucius 269

Chinese teacher, editor, politician, and philosopher -551–-479 BC

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“The utmost extent of man's knowledge, is to know that he knows nothing.”

Joseph Addison (1672–1719) politician, writer and playwright

These words, sometimes attributed to Addison, are not found in his works, but in The Spectator, no. 54, he translates the following words of Socrates, as quoted in Plato's Apology: "When I left him, I reasoned thus with myself: I am wiser than this man, for neither of us appears to know anything great and good; but he fancies he knows something, although he knows nothing; whereas I, as I do not know anything, so I do not fancy I do. In this trifling particular, then, I appear to be wiser than he, because I do not fancy I know what I do not know."
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Misattributed
Source: https://www.nytimes.com/1995/01/01/magazine/lives-well-lived-karl-popper-the-philosopher-as-giantslayer.html