What is learned without pleasure is forgotten without remorse.

Man is troubled not by events, but by the meaning he gives them.

When any person treats you ill or speaks ill of you, remember that he does this or says this because he thinks it is his duty. It is not possible, then, for him to follow that which seems right to you, but that which seems right to himself.

To be getting an education means this: to be learning what is your own, and what is not your own.

It is difficulties that show what men are. For the future, in case of any difficulty, remember that God, like a gymnastic trainer, has pitted you against a rough antagonist. For what end? That you may be an Olympic conqueror; and this cannot be without toil.

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

Shall I show you the sinews of a philosopher? What sinews are those? - A will undisappointed; evils avoided; powers daily exercised; careful resolutions; unerring decisions.