The paradox is now fully established that the utmost abstractions are the true weapons with which to control our thought of concrete fact.

Religion is the last refuge of human savagery.

The defense of morals is the battle-cry which best rallies stupidity against change.

Fundamental progress has to do with the reinterpretation of basic ideas.

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

Each human being is a more complex structure than any social system to which he belongs.

The aims of scientific thought are to see the general in the particular and the eternal in the transitory.