When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That's relativity.

One who scorns the power of intuition will never rise above the ranks of journeyman calculator.

Most of the fundamental ideas of science are essentially simple, and may, as a rule, be expressed in a language comprehensible to everyone.

I never teach my pupils, I only attempt to provide the conditions in which they can learn.

If you have never failed, you have never tried anything new.

If I would be a young man again and had to decide how to make my living, I would not try to become a scientist or scholar or teacher. I would rather choose to be a plumber or a peddler in hope to find that modest degree of independence still available under present circumstances.

Galileo - the father of modern physics - indeed of modern science.