When you have put a lot of ideas together to make an elaborate theory, you want to make sure, when explaining what it fits, that those things it fits are not just the things that gave you the idea for the theory; but that the finished theory makes something else come out right, in addition.

— Richard P. Feynman

Richard P. Feynman Quotes

Trees are made of air, primarily. When they are burned, they go back to air, and in the flaming heat is released the flaming heat of the Sun which was bound in to convert the air into tree. And in the ash is the small remnant of the part which did not come from air, that came from the solid earth, instead.

— Richard P. Feynman

So the drawing teacher has this problem of communicating how to draw by osmosis and not by instruction, while the physics teacher has the problem of always teaching techniques, rather than the spirit, of how to go about solving physical problems.

— Richard P. Feynman

Mathematics is not a science from our point of view, in the sense that it is not a natural science. The test of its validity is not experiment. We must, incidentally, make it clear from the beginning that if a thing is not a science, it is not necessarily bad. For example, love is not a science. So, if something is said not to be a science, it does not mean that there is something wrong with it; it just means that it is not a science.

— Richard P. Feynman

I can’t understand anything in general unless I’m carrying along in my mind a specific example and watching it go. Some people think in the beginning that I’m kind of slow and I don’t understand the problem, because I ask a lot of these “dumb” questions:.

— Richard P. Feynman

When a person has been negative to you, and then you do something like that, they’re usually a hundred percent the other way, kind of to compensate.

— Richard P. Feynman

When you have put a lot of ideas together to make an elaborate theory, you want to make sure, when explaining what it fits, that those things it fits are not just the things that gave you the idea for the theory; but that the finished theory makes something else come out right, in addition.

— Richard P. Feynman

The sciences do not directly teach good and bad.

— Richard P. Feynman

So we see that a substance’s properties must be limited in a certain way; one cannot make up anything he wants, or he would be able to invent a substance which he could use to produce more than the maximum allowable work when he carried it around a reversible cycle. This principle, this limitation, is the only real rule that comes out of the thermodynamics.

— Richard P. Feynman

Incidentally, they had a fire in that room, because of all the chaotic mess that they had – too many wires – and it destroyed the cyclotron. But I’d better not tell about that!

— Richard P. Feynman

Buddhist religion: “To every man is given the key to the gates of heaven; the same key opens the gates of hell.

— Richard P. Feynman

Our freedom to doubt was born of a struggle against authority in the early days of science.

— Richard P. Feynman

But, of course, a child won’t learn what you teach him.

— Richard P. Feynman

The question of doubt and uncertainty is what is necessary to begin; for if you already know the answer there is no need to gather any evidence about it.

— Richard P. Feynman

What is this law of gravitation? It is that every object in the universe attracts every other object with a force which for any two bodies is proportional to the mass of each and varies inversely as the square of the distance between them.

— Richard P. Feynman

What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia be silent?

— Richard P. Feynman

This was a tremendous idea – that to find something out, it is better to perform some careful experiments than to carry on deep philosophical arguments.

— Richard P. Feynman

But this long history of learning how to not fool ourselves – of having utter scientific integrity – is, I’m sorry to say, something that we haven’t specifically included in any particular course that I know of. We just hope you’ve caught on by osmosis.

— Richard P. Feynman

We do not yet know all the basic laws: there is an expanding frontier of ignorance.

— Richard P. Feynman

We just have to take what we see, and then formulate all the rest of our ideas in terms of our actual experience.

— Richard P. Feynman

Have you read anywhere, by any poet, anything about time that compares with real time, with the long, slow process of evolution?

— Richard P. Feynman
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