This has been done elegantly by Minkowski; but chalk is cheaper than grey matter, and we will do it as it comes.

As the area of light expands, so does the perimeter of darkness.

Somebody who only reads newspapers and at best books of contemporary authors looks to me like an extremely near-sighted person who scorns eyeglasses. He is completely dependent on the prejudices and fashions of his times, since he never gets to see or hear anything else.

We should take care not to make the intellect our god; it has, of course, powerful muscles, but no personality.

If [quantum theory] is correct, it signifies the end of physics as a science.

People are like bicycles. They can keep their balance only as long as they keep moving.

Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.