The only use of a knowledge of the past is to equip us for the present. The present contains all that there is. It is holy ground; for it is the past, and it is the future.

No man of science wants merely to know. He acquires knowledge to appease his passion for discovery. He does not discover in order to know, he knows in order to discover.

To see what is general in what is particular, and what is permanent in what is transitory, is the aim of scientific thought.

Value is coextensive with reality.

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

I consider Christian theology to be one of the great disasters of the human race.

By relieving the brain of all unnecessary work, a good notation sets it free to concentrate on more advanced problems, and in effect increases the mental power of the race.