An ounce of action is worth a ton of theory.
In theory there is no difference between theory and practice. In practice there is.
If the facts don't fit the theory, change the facts.
There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable.There is another theory which states that this has already happened.
Whenever a theory appears to you as the only possible one, take this as a sign that you have neither understood the theory nor the problem which it was intended to solve.
Experience without theory is blind, but theory without experience is mere intellectual play.
I have a theory that the truth is never told during the nine-to-five hours.
Do not put too much confidence in experimental results until they have been confirmed by theory.
Imagination is more important than knowledge.
A theory is the more impressive the greater is the simplicity of its premises, the more different are the kinds of things it relates and the more extended the range of its applicability.
It should not be forgotten that art is not a science where the latest 'correct' theory declares the old to be false and erases it.
Theory has nothing to do with a work of art. Pictures which are interpretable, and which contain a meaning, are bad pictures. A picture presents itself as the Unmanageable, the Illogical, the Meaningless.
Art is like a butterfly fluttering in a meadow. Analysis of art is like a butterfly on a pin. Each has its value, but we must always be aware of the difference, and what is gained or lost.
You know it's very hard to maintain a theory in the face of life that comes crashing about you.
I can't stand theory because it is imposed by the intellectual. And the intellectual is, by definition, not a creative person. The intellectual is a person who talks about the creative process, but often doesn't understand it.
I grow daily to honor facts more and more, and theory less and less.
No amount of experimentation can ever prove me right; a single experiment can prove me wrong.
We are all agreed that your theory is crazy. The question which divides us is whether it is crazy enough to have a chance of being correct. My own feeling is that it is not crazy enough.
The girl I find who wants to talk about quantum theory in a bar is the one I want to marry.
If the Confederacy fails, there should be written on its tombstone: Died of a Theory.
All theory, dear friend, is gray, but the golden tree of life springs ever green.
A theory is no more like a fact than a photograph is like a person.
The theory seems to be that as long as a man is a failure he is one of God's children, but that as soon as he succeeds he is taken over by the Devil.
A theory has only the alternative of being right or wrong. A model has a third possibility: it may be right, but irrelevant.
Delight at having understood a very abstract and obscure system leads most people to believe in the truth of what it demonstrates.
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