Knowledge has to be improved, challenged, and increased constantly, or it vanishes.

Consider your origins: you were not made to live as brutes, but to follow virtue and knowledge

The knowledge of yourself will preserve you from vanity.

Life lived for tomorrow will always be just a day away from being realized.

Everything that irritates us about others can lead us to an understanding of ourselves.

Expect problems and eat them for breakfast.

There are years that ask questions and years that answer.

What we really are matters more than what other people think of us.

Never bend your head. Always hold it high. Look the world straight in the eye.

If you aren't fired with enthusiasm, you will be fired with enthusiasm.