If you are distressed by anything external, the pain is not due to the thing itself, but to your estimate of it; and this you have the power to revoke at any moment.

You are a little soul carrying about a corpse, as Epictetus used to say.

From the philosopher Catulus, never to be dismissive of a friend's accusation, even if it seems unreasonable, but to make every effort to restore the relationship to its normal condition.

Misfortune nobly born is good fortune.

The things you think about determine the quality of your mind.

You have the power to strip away many superfluous troubles located wholly in your judgement, and to possess a large room for yourself embracing in thought the whole cosmos, to consider everlasting time, to think of the rapid change in the parts of each thing, of how short it is from birth until dissolution, and how the void before birth and that after dissolution are equally infinite.