Tell me what you feel in your room when the full moon is shining in upon you and your lamp is dying out, and I will tell you how old you are, and I shall know if you are happy.

Men prefer the false due to habit, passion, will. Preference for truth is rare. Men are ruled by their fear of truth.

A man without passion is only a latent force, only a possibility, like a stone waiting for the blow from the iron to give forth sparks.

The immense majority of our species are candidates for humanity, and nothing more.

Society rests upon conscience, not upon science.

It is by teaching that we teach ourselves, by relating that we observe, by affirming that we examine, by showing that we look, by writing that we think, by pumping that we draw water into the well.

Self-interest is but the survival of the animal in us. Humanity only begins for man with self-surrender.