errare humanum est, sed perseverare diabolicum: 'to err is human, but to persist (in the mistake) is diabolical.

If wisdom were offered me with this restriction, that I should keep it close and not communicate it, I would refuse the gift

No man ever became wise by chance

No man can live happily who regards himself alone, who turns everything to his own advantage. Thou must live for another, if thou wishest to live for thyself.

If wisdom were offered me with the provision that I should keep it shut up and refrain from declaring it, I should refuse. There's no delight in owning anything unshared.

Life is a play. It's not its length, but its performance that counts.