Just because you believe in something does not mean that it is true.

It is my inner conviction that the development of science seeks in the main to satisfy the longing for pure knowledge.

It's not that I'm so smart, it's just that I stay with problems longer.

The most important tool of the theoretical physicist is his wastebasket.

The music of Mozart is of such purity and beauty that one feels he merely found it - that it has always existed as part of the inner beauty of the universe waiting to be revealed.

Curiosity is its own reason.

The indifference, callousness and contempt that so many people exhibit toward animals is evil first because it results in great suffering in animals, and second because it results in an incalculably great impoverishment of the human spirit.