The highest forms of understanding we can achieve are laughter and human compassion.

Tell your son to stop trying to fill your head with science - for to fill your heart with love is enough!

We can deduce, often, from one part of physics like the law of gravitation, a principle which turns out to be much more valid than the derivation.

By honest I don't mean that you only tell what's true. But you make clear the entire situation. You make clear all the information that is required for somebody else who is intelligent to make up their mind.

I have a friend who's an artist, and he sometimes takes a view which I don't agree with. He'll hold up a flower and say, "Look how beautiful it is," and I'll agree. But then he'll say, "I, as an artist, can see how beautiful a flower is. But you, as a scientist, take it all apart and it becomes dull." I think he's kind of nutty. [...] There are all kinds of interesting questions that come from a knowledge of science, which only adds to the excitement and mystery and awe of a flower. It only adds. I don't understand how it subtracts.

I have argued flying saucers with lots of people. I was interested in possible. They do not appreciate that the problem is not to demonstrate whether it's possible or not but whether it's going on or not.

If an apple was magnified to the size of the Earth, then the atoms in the apple would be approximately the size of the original apple.