Control thy passions lest they take vengence on thee.

The origin of sorrow is this: to wish for something that does not come to pass.

Not things, but opinions about things, trouble men.

If you want to improve, be content to be thought foolish and stupid.

What really frightens and dismays us is not external events themselves, but the way in which we think about them. It is not things that disturb us, but our interpretation of their significance.

If any be unhappy, let him remember that he is unhappy by reason of himself alone. For God hath made all men to enjoy felicity and constancy of good.

Seek not good from without; seek it within yourselves, or you will never find it.