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" Once I get on a puzzle, I can't get off. "

Richard P. Feynman

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" Until I began to learn to draw, I was never much interested in looking at art. "

Richard P. Feynman

" The extreme weakness of quantum gravitational effects now poses some philosophical problems; maybe nature is trying to tell us something new here: maybe we should not try to quantize gravity. "

Richard P. Feynman

" Each piece, or part, of the whole of nature is always merely an approximation to the complete truth, or the complete truth so far as we know it. In fact, everything we know is only some kind of approximation because we know that we do not know all the laws as yet. "

Richard P. Feynman

" I decided to sell my drawings. However, I didn't want people to buy my drawings because the professor of physics isn't supposed to be able to draw - isn't that wonderful - so I made up a false name. "

Richard P. Feynman

" It is in the admission of ignorance and the admission of uncertainty that there is a hope for the continuous motion of human beings in some direction that doesn't get confined, permanently blocked, as it has so many times before in various periods in the history of man. "

Richard P. Feynman

" Poets say science takes away from the beauty of the stars - mere globs of gas atoms. I, too, can see the stars on a desert night, and feel them. But do I see less or more? "

Richard P. Feynman

" Do not keep saying to yourself, if you can possibly avoid it, 'But how can it be like that?' because you will get 'down the drain,' into a blind alley from which nobody has yet escaped. Nobody knows how it can be like that. "

Richard P. Feynman

" I was terrible in English. I couldn't stand the subject. It seemed to me ridiculous to worry about whether you spelled something wrong or not, because English spelling is just a human convention - it has nothing to do with anything real, anything from nature. "

Richard P. Feynman

" 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. "

Richard P. Feynman

" The first principle is that you must not fool yourself and you are the easiest person to fool. "

Richard P. Feynman

" I thought one should have the attitude of 'What do you care what other people think!' "

Richard P. Feynman

" The situation in the sciences is this: A concept or an idea which cannot be measured or cannot be referred directly to experiment may or may not be useful. It need not exist in a theory. "

Richard P. Feynman

" We get the exciting result that the total energy of the universe is zero. Why this should be so is one of the great mysteries - and therefore one of the important questions of physics. After all, what would be the use of studying physics if the mysteries were not the most important things to investigate? "

Richard P. Feynman

" In talking about the impact of ideas in one field on ideas in another field, one is always apt to make a fool of oneself. "

Richard P. Feynman

" Trying to understand the way nature works involves a most terrible test of human reasoning ability. It involves subtle trickery, beautiful tightropes of logic on which one has to walk in order not to make a mistake in predicting what will happen. The quantum mechanical and the relativity ideas are examples of this. "

Richard P. Feynman

" All the evidence, experimental and even a little theoretical, seems to indicate that it is the energy content which is involved in gravitation, and therefore, since matter and antimatter both represent positive energies, gravitation makes no distinction. "

Richard P. Feynman

" Quarks came in a number of varieties - in fact, at first, only three were needed to explain all the hundreds of particles and the different kinds of quarks - they are called u-type, d-type, s-type. "

Richard P. Feynman

" The philosophical question before us is, when we make an observation of our track in the past, does the result of our observation become real in the same sense that the final state would be defined if an outside observer were to make the observation? "

Richard P. Feynman

" Nature uses only the longest threads to weave her patterns, so that each small piece of her fabric reveals the organization of the entire tapestry. "

Richard P. Feynman

" If I get stuck, I look at a book that tells me how someone else did it. I turn the pages, and then I say, 'Oh, I forgot that bit,' then close the book and carry on. Finally, after you've figured out how to do it, you read how they did it and find out how dumb your solution is and how much more clever and efficient theirs is! "

Richard P. Feynman

" With the exception of gravitation and radioactivity, all of the phenomena known to physicists and chemists in 1911 have their ultimate explanation in the laws of quantum electrodynamics. "

Richard P. Feynman

" The most remarkable discovery in all of astronomy is that the stars are made of atoms of the same kind as those on the earth. "

Richard P. Feynman

" The universe is very large, and its boundaries are not known very well, but it is still possible to define some kind of a radius to be associated with it. "

Richard P. Feynman

" I believe that a scientist looking at nonscientific problems is just as dumb as the next guy. "

Richard P. Feynman

" Because atomic behavior is so unlike ordinary experience, it is very difficult to get used to, and it appears peculiar and mysterious to everyone - both to the novice and to the experienced physicist. "

Richard P. Feynman

" Reality must take precedence over public relations, for nature cannot be fooled. "

Richard P. Feynman

" I don't know what's the matter with people: they don't learn by understanding; they learn by some other way - by rote, or something. Their knowledge is so fragile! "

Richard P. Feynman

" The first amazing fact about gravitation is that the ratio of inertial mass to gravitational mass is constant wherever we have checked it. The second amazing thing about gravitation is how weak it is. "

Richard P. Feynman

" First figure out why you want the students to learn the subject and what you want them to know, and the method will result more or less by common sense. "

Richard P. Feynman

" 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! "

Richard P. Feynman