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