„The wisest of all, in my opinion, is he who can, if only once a month, call himself a fool — a faculty unheard of nowadays.“

— Fyodor Dostoyevsky

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„There was never a genius who was not thought a fool until he disclosed himself; whereas he is a fool then only.“
— Ambrose Bierce
„He that is taught only by himself has a fool for a master.“
— Hunter S. Thompson
„The fool doth think he is wise, but the wise man knows himself to be a fool.“
— William Shakespeare
„A physician who treats himself has a fool for a patient.“
— William Osler