All the time you're saying to yourself, 'I could do that, but I won't,'--which is just another way of saying that you can't.

We need to teach how doubt is not to be feared but welcomed. It's OK to say, "I don't know."

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.

A poet once said, "The whole universe is in a glass of wine." We will probably never know in what sense he meant that, for poets do not write to be understood... How vivid is the claret, pressing its existence into the consciousness that watches it! If our small minds, for some convenience, divide this glass of wine, this universe, into parts - physics, biology, geology, astronomy, psychology, and so on - remember that nature does not know it! So let us put it all back together, not forgetting ultimately what it is for. Let it give us one more final pleasure: drink it and forget it all!

Science is like sex: sometimes something useful comes out, but that is not the reason we are doing it

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.

There is nothing that living things do that cannot be understood from the point of view that they are made of atoms acting according to the laws of physics.