If you would know contentment, let your deeds be few.
Men will cease to be fools only when they cease to be men.
Life unexamined, is not worth living.
No power and no treasure can outweigh the extension of our knowledge.
According to convention there is a sweet and a bitter, a hot and a cold, and according to convention, there is an order. In truth, there are atoms and a void.
Do not trust all men, but trust men of worth; the former course is silly, the latter a mark of prudence.