There is strong shadow where there is much light.

Let him who believes in immortality enjoy his happiness in silence; he has no reason to give himself airs about it.

No two men see the world exactly alike, and different temperaments will apply in different ways a principle that they both acknowledge.

First and last, what is demanded of genius is love of truth.

What is my life if I am no longer useful to others.

A mathematician is only perfect insofar as he is a perfect man, sensitive to the beauty of truth.

What makes people happy is activity; changing evil itself into good by power, working in a God like manner.