I don't believe in mathematics.

Mozart's music is so pure and beautiful that I see it as a reflection of the inner beauty of the universe.

The individual feels the vanity of human desires and aims, and the nobility and marvelous order which are revealed in nature and in the world of thought. He feels the individual destiny as an imprisonment and seeks to experience the totality of existence as a unity full of significance.

The only way to escape the corruptible effect of praise is to go on working.

It is also a natural thing for a serious young man that he should form for himself as precise an idea as possible of the goal of his desires.

Playfullness is the essential feature of productive thought.

The world is not full of evil because of those who do wrong. It is full of evil because of those who do nothing.