Conceit is incompatible with understanding.

In all history there is no war which was not hatched by the governments, the governments alone, independent of the interests of the people, to whom war is always pernicious even when successful.

I must have physical exercise, or my temper'll certainly be ruined.

The essence of any religion lies solely in the answer to the question: why do I exist, and what is my relationship to the infinite universe that surrounds me? It is impossible for there to be a person with no religion (i.e. without any kind of relationship to the world) as it is for there to be a person without a heart. He may not know that he has a religion, just as a person may not know that he has a heart, but it is no more possible for a person to exist without a religion than without a heart.

People try to do all sorts of clever and difficult things to improve life instead of doing the simplest, easiest thing-refusing to participate in activities that make life bad.

The march of humanity, springing as it does from an infinite multitude of individual wills, is continuous.

Every man had his personal habits, passions, and impulses toward goodness, beauty, and truth.