True art is characterized by an irresistible urge in the creative artist.

The whole of science is nothing more than a refinement of everyday thinking.

To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science.

It was the experience of mystery - even if mixed with fear - that engendered religion.

It can scarcely be denied that the supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a single datum of experience.

Science is a wonderful thing if one does not have to earn one's living at it.