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

In fact the total amount that a physicist knows is very little. He has only to remember the rules to get him from one place to another and he is all right.

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.

Any schemes - such as 'think of symmetry laws', or 'put the information in mathematical form', or 'guess equations'- are known to everybody now, and they are all tried all the time. When you are stuck, the answer cannot be one of these, because you will have tried these right away...The next scheme, the new discovery, is going to be made in a completely different way.

No man is rich who is unsatisfied, but who wants nothing possess his heart's desire.

You do not know anything until you have practiced.

You see, I get such fun out of thinking that I don't want to destroy this most pleasant machine that makes life such a big kick.