A man of business will often deceive you without the slightest scruple, but he will absolutely refuse to commit a theft.

Empirical sciences prosecuted purely for their own sake, and without philosophic tendency are like a face without eyes.

Most men are so thoroughly subjective that nothing really interests them but themselves.

Everybody's friend is nobody's.

It is the courage to make a clean breast of it in the face of every question that makes the philosopher. He must be like Sophocles' Oedipus, who, seeking enlightenment concerning his terrible fate, pursues his indefatigable inquiry even though he divines that appalling horror awaits him in the answer. But most of us carry with us the Jocasta in our hearts, who begs Oedipus, for God's sake, not to inquire further.

Every genius is a great child; he gazes out at the world as something strange, a spectacle, and therefore with purely objective interest

Consciousness is the mere surface of our minds, of which, as of the earth, we do not know the inside, but only the crust.