The scientist has a lot of experience with ignorance and doubt and uncertainty, and this experience is of very great importance, I think. When a scientist doesn’t know the answer to a problem, he is ignorant. When he has a hunch as to what the result is, he is uncertain. And when he is pretty damn sure of what the result is going to be, he is still in some doubt. We have found it of paramount importance that in order to progress, we must recognize our ignorance and leave room for doubt. Scientific knowledge is a body of statements of varying degrees of certainty — some most unsure, some nearly sure, but none absolutely certain. Now, we scientists are used to this, and we take it for granted that it is perfectly consistent to be unsure, that it is possible to live and not know. But I don’t know whether everyone realizes this is true. Our freedom to doubt was born out of a struggle against authority in the early days of science. It was a very deep and strong struggle: permit us to question — to doubt — to not be sure. I think that it is important that we do not forget this struggle and thus perhaps lose what we have gained.


Richard Feynman

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Today, all physicists know from studying Einstein and Bohr that sometimes an idea which looks comple...
RICHARD P. FEYNMAN
Things on a very small scale behave like nothing that you have any direct experience about. They do ...
RICHARD P. FEYNMAN
I got a signed document from Bullock's saying that they had such-and-such drawings on consignmen...
RICHARD P. FEYNMAN
All the evidence, experimental and even a little theoretical, seems to indicate that it is the energ...
RICHARD P. FEYNMAN
The extreme weakness of quantum gravitational effects now poses some philosophical problems; maybe n...
RICHARD P. FEYNMAN
Gravitation is, so far, not understandable in terms of other phenomena.
RICHARD P. FEYNMAN
With the exception of gravitation and radioactivity, all of the phenomena known to physicists and ch...
RICHARD P. FEYNMAN
It always seems odd to me that the fundamental laws of physics, when discovered, can appear in so ma...
RICHARD P. FEYNMAN
We get the exciting result that the total energy of the universe is zero. Why this should be so is o...
RICHARD P. FEYNMAN
Investigating the forces that hold the nuclear particles together was a long task.
RICHARD P. FEYNMAN
In the Raphael Room, the secret turned out to be that only some of the paintings were made by the gr...
RICHARD P. FEYNMAN
There is a computer disease that anybody who works with computers knows about. It's a very serio...
RICHARD P. FEYNMAN
The most obvious characteristic of science is its application: the fact that, as a consequence of sc...
RICHARD P. FEYNMAN
You're unlikely to discover something new without a lot of practice on old stuff, but further, y...
RICHARD P. FEYNMAN
Once you have a computer that can do a few things - strictly speaking, one that has a certain 's...
RICHARD P. FEYNMAN
I think equation guessing might be the best method to proceed to obtain the laws for the part of phy...
RICHARD P. FEYNMAN
Einstein's gravitational theory, which is said to be the greatest single achievement of theoreti...
RICHARD P. FEYNMAN
If we have an atom that is in an excited state and so is going to emit a photon, we cannot say when ...
RICHARD P. FEYNMAN
When I would hear the rabbi tell about some miracle such as a bush whose leaves were shaking but the...
RICHARD P. FEYNMAN
We do not know where to look, or what to look for, when something is memorized. We do not know what ...
RICHARD P. FEYNMAN
From the point of view of basic physics, the most interesting phenomena are, of course, in the new p...
RICHARD P. FEYNMAN
The correct statement of the laws of physics involves some very unfamiliar ideas which require advan...
RICHARD P. FEYNMAN
I've always been very one-sided about science, and when I was younger, I concentrated almost all...
RICHARD P. FEYNMAN
Often one postulates that a priori, all states are equally probable. This is not true in the world a...
RICHARD P. FEYNMAN
Once I get on a puzzle, I can't get off.
RICHARD P. FEYNMAN
Today we say that the law of relativity is supposed to be true at all energies, but someday somebody...
RICHARD P. FEYNMAN
I practiced drawing all the time and became very interested in it. If I was at a meeting that wasn&#...
RICHARD P. FEYNMAN
If you keep proving stuff that others have done, getting confidence, increasing the complexities of ...
RICHARD P. FEYNMAN
The situation in the sciences is this: A concept or an idea which cannot be measured or cannot be re...
RICHARD P. FEYNMAN
Physics has a history of synthesizing many phenomena into a few theories.
RICHARD P. FEYNMAN
Because atomic behavior is so unlike ordinary experience, it is very difficult to get used to, and i...
RICHARD P. FEYNMAN
The original reason to start the project, which was that the Germans were a danger, started me off o...
RICHARD P. FEYNMAN
It has not yet become obvious to me that there's no real problem. I cannot define the real probl...
RICHARD P. FEYNMAN
We are at the very beginning of time for the human race. It is not unreasonable that we grapple with...
RICHARD P. FEYNMAN
I was terrible in English. I couldn't stand the subject. It seemed to me ridiculous to worry abo...
RICHARD P. FEYNMAN
I was a very shy character, always feeling uncomfortable because everybody was stronger than I, and ...
RICHARD P. FEYNMAN
If you realize all the time what's kind of wonderful - that is, if we expand our experience into...
RICHARD P. FEYNMAN
I don't understand what it's all about or what's worth what, but if the people in the Sw...
RICHARD P. FEYNMAN
Atoms are very special: they like certain particular partners, certain particular directions, and so...
RICHARD P. FEYNMAN
The fact is that a bill allowing any employer to deny insurance coverage based on a moral objection ...
RICHARD CARMONA
One of the great cosmic laws, I think, is that whatever we hold in our thought will come true in our...
RICHARD BACH
The first step towards knowledge is to know that we are ignorant.
RICHARD CECIL
From my very first day as an entrepreneur, I've felt the only mission worth pursuing in business...
RICHARD BRANSON
I am fond of them, of the inferior beings of the abyss, of those who are full of longing.
RICHARD WAGNER
There's something about shadows because you make your own mind up about what's lurking in th...
RICHARD O'BRIEN
I hate cameras. They interfere, they're always in the way. I wish: if I could work with my eyes ...
RICHARD AVEDON
Primates need good nutrition, to begin with. Not only fruits and plants, but insects as well.
RICHARD LEAKEY
I gave my life to become the person I am right now. Was it worth it?
RICHARD BACH
Learning is finding out what you already know.
RICHARD BACH
Our soulmate is the one who makes life come to life.
RICHARD BACH
Strong beliefs win strong men, and then make them stronger.
RICHARD BACH