In a rich man's house there is no place to spit but his face.

Of what use is a philosopher who doesn't hurt anybody's feelings?

Nothing can be produced out of nothing.

To arrive at perfection, a man should have very sincere friends or inveterate enemies; because he would be made sensible of his good or ill conduct, either by the censures of the one or the admonitions of the other.

When I look upon seamen, men of science and philosophers, man is the wisest of all beings; when I look upon priests and prophets nothing is as contemptible as man.

Protagoras asserted that there are two sides to every question, exactly opposite to each other.

No man is hurt but by himself. ...Literally by how he interprets what happens to him. If he focusses on how it could have been better, he will be hurt. If he focusses on how it could have been worse, he will be happy. The same is true for women too.