Doubt is clearly a value in science. It is important to doubt and that the doubt is not a fearful thing, but a thing of great value.

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

People may come along and argue philosophically that they like one better than another; but we have learned from much experience that all philosophical intuitions about what nature is going to do fail.

The principle of science, the definition, almost, is the following: The test of all knowledge is experiment. Experiment is the sole judge of scientific "truth." But what is the source of knowledge? Where do the laws that are to be tested come from? Experiment, itself, helps to produce these laws, in the sense that it gives us hints. But also needed is imagination to create from these hints the great generalizations--to guess at the wonderful, simple, but very strange patterns beneath them all, and then to experiment to check again whether we have made the right guess.

Start out understanding religion by saying everything is possibly wrong... As soon as you do that, you start sliding down an edge which is hard to recover from.

I am not interested in what today's mathematicians find interesting.

Nature does not care what we call it, she just keeps on doing it.