The emotions aren't always immediately subject to reason, but they are always immediately subject to action.

Anything you may hold firmly in your imagination can be yours.

The worst thing that can happen to a good teacher is to get a bad conscience about her profession because she feels herself hopeless as a psychologist.

Since you make evil or good by your own thoughts, it is your ruling of your thoughts which proves to be your principal concern.

If you can change your mind, you can change your life.

The greatest empiricists among us are only empiricists on reflection: when left to their instincts, they dogmatize like infallible popes.

If an unusual necessity forces us onward, a surprising thing occurs. The fatigue gets worse up to a certain point, when, gradually or suddenly, it passes away and we are fresher than before!