He is a wise man who does not grieve for the things which he has not, but rejoices…

Make the best use of what is in your power, and take the rest as it happens.

No man is free who is not master of himself.

Seek not the good in external things; seek it in yourselves.

First say to yourself what you would be; and then do what you have to do.

People are disturbed not by a thing, but by their perception of a thing.