Man comes from a drop of semen and leaves as a piece of dust. He doesn't know when he came and he doesn't know when he's leaving, yet he walks on the earth thinking he knows everything.
The best revenge is to improve yourself.
He who trusts the world, the world betrays him.
Courtesy costs nothing, but buys everything.
Know thyself, and thou shalt know God.
Of all the follies the greatest is to love the world.