True ideas are those that we can assimilate, validate, corroborate, and verify. False ideas are those that we cannot

The desire to gain wealth and the fear to lose it are our chief breeders of cowardice and propagators of corruption.

Faith is one of the forces by which men live, and the total absence of it means collapse

Seek out that particular mental attribute which makes you feel most deeply and vitally alive.

To know psychology, therefore, is absolutely no guarantee that we shall be good teacher.

Marvelous as may be the power of my dog to understand my moods, deathless as his affection and fidelity, his mental state is as unsolved a mystery to me as it was to my remotest ancestor.

Philosophy is "an unusually stubborn attempt to think clearly.