Confucius 孔子
5th century BC · Lu, Spring and Autumn China · To his pupil Zilu
"To say you know when you know, and to say you do not when you do not: that is knowledge."
知之爲知之，不知爲不知，是知也。Analects, book 2 (Wei Zheng)
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In the same thread
Rene Descartes René Descartes
1637 · France · the Netherlands
Good sense is the best shared-out thing in the world; for everyone thinks himself so well supplied with it that even those who are hardest to please in everything else do not usually want more of it than they have.
Le bon sens est la chose du monde la mieux partagée; car chacun pense en être si bien pourvu, que ceux même qui sont les plus difficiles à contenter en toute autre chose n'ont point coutume d'en désirer plus qu'ils en ont.
Discourse on Method, the first sentence
Akutagawa Ryunosuke 芥川龍之介
1923 · Taisho Japan
A fool always takes everyone but himself for a fool.
阿呆はいつも彼以外の人人を悉く阿呆と考えている。Words of a Dwarf (Shuju no kotoba)
Rene Descartes René Descartes
1637 · France · the Netherlands
I think, therefore I am.
je pense, donc je suis
Discourse on Method, part 4
Baruch Spinoza Benedictus de Spinoza
1677 · Amsterdam, the Netherlands · The Hague
But all things excellent are as difficult as they are rare.Ethics, the last sentence · in place of the original: the English translation by R. H. M. Elwes (1883)
1 in 100 Billion · The social network of those who came before us