This attitude of mind - this attitude of uncertainty - is vital to the scientist, and it is this attitude of mind which the student must first acquire. It becomes a habit of thought. Once acquired, we cannot retreat from it anymore.

If you keep proving stuff that others have done, getting confidence, increasing the complexities of your solutions - for the fun of it - then one day you'll turn around and discover that nobody actually did that one! And that's the way to become a computer scientist.

The electron is a theory we use; it is so useful in understanding the way nature works that we can almost call it real.

The inside of a computer is as dumb as hell but it goes like mad!

It is surprising that people do not believe that there is imagination in science. It is a very interesting kind of imagination, unlike that of the artist. The great difficulty is in trying to imagine something that you have never seen, that is consistent in every detail with what has already been seen, and that is different from what has been thought of; furthermore, it must be definite and not a vague proposition. That is indeed difficult.

The test of all knowledge is experiment. Experiment is the sole judge of scientific truth.

I'm going to play with physics, whenever I want to, without worrying about any importance whatsoever.