I am only a philosopher, and there is only one thing that a philosopher can be relied on to do, and that is, to contradict other philosophers.

All natural goods perish. Riches take wings; fame is a breath; love is a cheat; youth and health and pleasure vanish.

You can't out-perform your self-image.

What a teacher needs to know about psychology "might almost be written on the palm of one's hand."

We never fully grasp the import of any true statement until we have a clear notion of what the opposite untrue statement would be.

To know psychology, therefore, is absolutely no guarantee that we shall be good teacher.

I will act as if I do make a difference.