Whenever anyone says, 'theoretically,' they really mean, 'not really.'

There was no 'before' the beginning of our universe, because once upon a time there was no time.

Science without religion is lame, religion without science is blind.

The most beautiful thing we can experience is the mysterious. It is the source of all true art and science.

To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science.