The mind uses its faculty for creativity only when experience forces it to do so.

The mathematical facts worthy of being studied are those which, by their analogy with other facts, are capable of leading us to the knowledge of a physical law.

The scientist does not study nature because it is useful he studies it because he delights in it, and he delights in it because it is beautiful.

It is through science that we prove, but through intuition that we discover.

Science is built up of facts, as a house is with stones. But a collection of facts is no more a science than a heap of stones is a house.