Happy contractedness of youth, nay, of mankind in general, that they think neither of the high nor the deep, of the true nor the false, but only of what is suited to their own conceptions.

The thought of death leaves me in perfect peace, for I have a firm conviction that our spirit is a being of indestructible nature; it works on from eternity to eternity, it is like the sun, which though it seems to set to our mortal eyes, does not really set, but shines on perpetually.

As soon as you are in a social setting, you better take away the key to the lock of your heart and pocket it; those who leave thekey in the lock are fools.

Life is not anything, but an opportunity for something.

A man's errors are what make him amiable.

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.

I wait for the morning of my tears