Discussion is impossible with someone who claims not to seek the truth, but already to possess it.

Take possession of the air, submit the elements, penetrate the last redoubts of nature, make space retreat, make death retreat.

Skepticism, riddling the faith of yesterday, prepared the way for the faith of tomorrow.

If a man is to shed the light of the sun upon other men, he must first of all have it within himself.

Most men are essentially dead by thirty.

Any man who is really a man must learn to be alone in the midst of others, to think alone for others, and, if necessary, against others.

Let us return to our eagle's nest in the Himalayas. It is waiting for us, for it is ours, eaglets of Europe, we need not renounce any part of our real nature...whence we formerly took our flight.