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Richard P. Feynman Quotes about Physics

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Have no respect whatsoever for authority; forget who said it and instead look what he starts with, where he ends up, and ask yourself, Is it reasonable?

Have no respect whatsoever for authority; forget who said it and instead look what he starts with, where he ends up, and ask yourself, "Is it reasonable?"

Richard P. Feynman
Looks, Physics, Forget
Richard P. Feynman (2011). “"What Do You Care What Other People Think?": Further Adventures of a Curious Character”, p.29, W. W. Norton & Company

In physics the truth is rarely perfectly clear, and that is certainly universally the case in human affairs. Hence, what is not surrounded by uncertainty cannot be the truth.

Richard P. Feynman
Physics, Affair, Truth Is
Richard P. Feynman (2015). “The Quotable Feynman”, p.290, Princeton University Press

There is no authority who decides what is a good idea.

Richard P. Feynman
Ideas, Physics, Authority
Richard P. Feynman (2009). “The Meaning of It All: Thoughts of a Citizen-Scientist”, p.14, Hachette UK

If all of mathematics disappeared, physics would be set back by exactly one week.

Richard P. Feynman
Would Be, Physics, Week

Turbulence is the most important unsolved problem of classical physics.

Richard P. Feynman
Important, Problem, Physics

So far as we know, all the fundamental laws of physics, like Newton's equations, are reversible.

Richard P. Feynman
Law, Fundamentals, Physics
Richard P. Feynman, Robert B. Leighton, Matthew Sands (2013). “The Feynman Lectures on Physics, vol. 1 for tablets”, Basic Books

In its efforts to learn as much as possible about nature, modern physics has found that certain things can never be "known" with certainty. Much of our knowledge must always remain uncertain. The most we can know is in terms of probabilities.

Richard P. Feynman
Effort, Physics, Modern
The Feynman Lectures on Physics (pp. 6-1 1)

I think I can safely say that nobody understands Quantum Mechanics.

Richard P. Feynman
Fake People, Thinking, Physics
The Character of Physical Law ch. 6 (1965)

Therefore psychologically we must keep all the theories in our heads, and every theoretical physicist who is any good knows six or seven different theoretical representations for exactly the same physics.

Richard P. Feynman
Different, Six, Physics
Richard P. Feynman (2015). “The Quotable Feynman”, p.161, Princeton University Press

As you know, a theory in physics is not useful unless it is able to predict underlined effects which we would otherwise expect.

Richard P. Feynman
Atheism, Able, Physics
Richard P. Feynman (2008). “Perfectly Reasonable Deviations from the Beaten Track: The Letters of Richard P. Feynman”, p.116, Hachette UK

All theoretical chemistry is really physics; and all theoretical chemists know it.

Richard P. Feynman
Chemistry, Physics, Knows

As revealed by physics, the truth is so remarkable, so amazing!

Richard P. Feynman
Physics, Truth Is, Remarkable

It's because somebody knows something about it that we can't talk about physics. It's the things that nobody knows anything about we can discuss.

Richard P. Feynman
Physics, Nobody Knows, Knows
Richard P Feynman (2014). “Surely You're Joking Mr Feynman: Adventures of a Curious Character as Told to Ralph Leighton”, p.310, Random House

Physicists like to think that all you have to do is say, these are the conditions, now what happens next?

Richard P. Feynman
Thinking, Next, Physics
Richard P. Feynman (2015). “The Quotable Feynman”, p.187, Princeton University Press

We can deduce, often, from one part of physics like the law of gravitation, a principle which turns out to be much more valid than the derivation.

Richard P. Feynman
Law, Principles, Physics
"The Character of Physical Law". Book by Richard P. Feynman, 1965.

I am going to tell you what nature behaves like. If you will simply admit that maybe she does behave like this, you will find her a delightful, entrancing thing. Do not keep saying to yourself, if you can possibly avoid it, 'But how can it be like that?' ...Nobody knows how it can be like that.

Richard P. Feynman
Science, Doe, Physics
"The Character of Physical Law". Book by Richard P. Feynman, 1965.

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