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

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.

Whatever you cannot understand, you cannot possess.

Every man must form himself as a particular being, seeking, however, to attain that general idea of which all mankind are constituents.

The style of an author is a faithful copy of his mind.

So long as you live and work, you will be misunderstood; to that you must resign yourself once and for all. Be silent!

When you praise someone you call yourself his equal.