“The unexamined life is not worth living.” — Socrates (actually Plato .. Socrates didn’t write, period).
“Excellence, then, is not an act, but a habit.” — Aristotle.
“I think, therefore I am.” — Descartes.
“Treat humanity, whether in your own person or in the person of any other, never simply as a means, but always at the same time as an end.” — Kant.
“First of all, man exists, turns up, appears on the scene, and, only afterwards, defines himself.” — Sartre
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