If you are to accomplish all that one demands of you, you must overestimate your own worth.

There is not a single outward mark of courtesy that does not have a deep moral basis.

The flowers of life are but illusions. How many fade away and leave no trace.

Mathematics has the completely false reputation of yielding infallible conclusions. Its infallibility is nothing but identity. Two times two is not four, but it is just two times two, and that is what we call four for short. But four is nothing new at all. And thus it goes on and on in its conclusions, except that in the higher formulas the identity fades out of sight.

People can only live with their equals, and not even with them; for in the long run they cannot tolerate that someone is their equal.

One mind is enough for a thousand hands.

Unlimited activity, of whatever kind, must end in bankruptcy.