It occurred to me by intuition, and music was the driving force behind that intuition. My discovery was the result of musical perception.

I came- though the child of entirely irreligious (Jewish) parents - to a deep religiousness, which, however, reached an abrupt end at the age of twelve.

He who cherishes the value of cultures cannot fail to be a pacifist.

The great moral teachers of humanity were in a way artistic geniuses in the art of living.

That deep emotional conviction of the presence of a superior reasoning power, which is revealed in the incomprehensible universe, forms my idea of God.

Creating a new theory is not like destroying an old barn and erecting a skyscraper in its place. It is rather like climbing a mountain, gaining new and wider views, discovering unexpected connections between our starting points and its rich environment. But the point from which we started out still exists and can be seen, although it appears smaller and forms a tiny part of our broad view gained by the mastery of the obstacles on our adventurous way up.

The road to perdition has ever been accompanied by lip service to an ideal.