We must produce a great age, or see the collapse of the upward striving of our race.

Life is an offensive, directed against the repetitious mechanism of the Universe.

An open mind is all very well in its way, but it ought not to be so open that there is no keeping anything in or out of it.

Learning preserves the errors of the past, as well as its wisdom. For this reason, dictionaries are public dangers, although they are necessities.

The absolute pacifist is a bad citizen; times come when force must be used to uphold right, justice and ideals.

Value is coextensive with reality.

No science can be more secure than the unconscious metaphysics which tacitly it presupposes.