The soul's impurity consists in bad judgements, and purification consists in producing in it right judgements, and the pure soul is one which has right judgements, for this alone is proof against confusion and pollution in its functions.

What concerns me is not the way things are, but rather the way people think things are.

Learn to distinguish what you can and can't control. Within our control are our own opinions, aspirations, desires and the things that repel us. They are directly subject to our influence.

Truth is a thing immortal and perpetual, and it gives to us a beauty that fades not away in time, nor does it take away the freedom of speech which proceeds from justice; but it gives to us the knowledge of what is just and lawful, separating from them the unjust and refuting them.

Men are not worried by things, but by their ideas about things. When we meet with difficulties, become anxious or troubled, let us not blame others, but rather ourselves. That is: our ideas about things.

To the rational being only the irrational is unendurable, but the rational is endurable.

We tell lies, yet it is easy to show that lying is immoral.