In formal logic, a contradiction is the signal of defeat, but in the evolution of real knowledge it marks the first step in progress toward a victory.

Education with inert ideas is not only useless; it is above all things harmful.

...the only simplicity to be trusted is the simplicity to be found on the far side of complexity.

It is the business of the future to be dangerous.

Religion is what the individual does with his own solitariness.

It does not matter what men say in words, so long as their activities are controlled by settled instincts. The words may ultimately destroy the instincts; but until this has occurred, words do not count.

Systems, scientific or philosophic, come and go. Each method of limited understanding is at length exhausted. In its prime each system is a triumphant success: in its decay it is an obstructive nuisance.