I have become rather like King Midas, except that everything turns not into gold but into a circus.

[Kepler] had to realize clearly that logical-mathematical theoretizing, no matter how lucid, could not guarantee truth by itself; that the most beautiful logical theory means nothing in natural science without comparison with the exactest experience. Without this philosophic attitude, his work would not have been possible.

God has given me a mule-like stubbornness to stick with a difficult problem and the intuitive powers to conceptualize complex hypothetical situations in my mind.

The truth of a theory is in your mind, not in your eyes.

Insofar as mathematics is true, it does not describe the real world. Insofar as it describes the real world, it is not true.

The height of stupidity is most clearly demonstrated by the individual who ridicules something he knows nothing about.

Three Rules of Work: Out of clutter find simplicity. From discord find harmony. In the middle of difficulty lies opportunity.