We will never be able to solve the problems of tomorrow with the thinking of today

Physics is essentially an intuitive and concrete science. Mathematics is only a means for expressing the laws that govern phenomena.

Stupidity is a personal achievement which transcends national boundaries.

I have never looked upon ease and happiness as ends in themselves. This ethical basis I call the ideal of the pigsty.

We can invent as many theories we like, and any one of them can be made to fit the facts. But that theory is always preferred which makes the fewest number of assumptions.

Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

The process of scientific discovery is, in effect, a continual flight from wonder.