Where the world ceases to be the scene of our personal hopes and wishes, where we face it as free beings admiring, asking and observing, there we enter the realm of Art and Science.

Knowledge is limited.

Most teachers waste their time by asking question which are intended to discover what a pupil does not know whereas the true art of questioning has for its purpose to discover what pupils knows or is capable of knowing.

The true measure of a man is the degree to which he has managed to subjugate his ego.

For scientific endeavor is a natural whole the parts of which mutually support one another in a way which, to be sure, no one can anticipate.

Paper is to write things down that we need to remember. Our brains are used to think.

The only real valuable thing is intuition. The intellect has little to do on the road to discovery