On the occasion of every accident that befalls you...inquire what power you have for turning it to use.

Circumstances do not make the man; they merely reveal him to himself.

We are not troubled by things, but by the opinion which we have of things.

Any person capable of angering you becomes your master; he can anger you only when you permit yourself to be disturbed by him.

He is a man of sense who does not grieve for what he has not, but rejoices in what he has.

Nothing can add more power to your life than concentrating all of your energies on a limited set of targets.