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.

What disturbs and alarms man are not the things, but his opinions and fancies about the things.

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

To live a life of virtue, you have to become consistent, even when it isn't convenient, comfortable, or easy.

Nothing outside the will can hinder or harm the will; it can only harm itself. If then we accept this, and, when things go amiss, are inclined to blame ourselves, remembering that judgment alone can disturb our peace and constancy, I swear to you by all the gods that we have made progress.

Books are the training weights of the mind.

Be not diverted from your duty by any idle reflections the silly world may make upon you, for their censures are not in your power and should not be at all your concerns.