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I can easily conceive, most Holy Father, that as soon as some people learn that in this book which I have written concerning the revolutions of the heavenly bodies, I ascribe certain motions to the Earth, they will cry out at once that I and my theory should be rejected.
Nicolaus Copernicus
Thought and theory must precede all salutary action; yet action is nobler in itself than either thought or theory.
Virginia Woolf
In theory one is aware that the earth revolves, but in practice one does not perceive it, the ground upon which one treads seems not to move, and one can live undisturbed. So it is with Time in one's life.
Marcel Proust
When a torrent sweeps a man against a boulder, you must expect him to scream, and you need not be surprised if the scream is sometimes a theory.
Robert Louis Stevenson
Rational behavior requires theory. Reactive behavior requires only reflex action.
W. Edwards Deming
Democracy is beautiful in theory; in practice it is a fallacy.
Benito Mussolini
Europe is so well gardened that it resembles a work of art, a scientific theory, a neat metaphysical system. Man has re-created Europe in his own image.
Aldous Huxley
It is an acknowledged truth in philosophy that a just theory will always be confirmed by experiment.
Thomas Malthus
Each pursues his own theory, little solicitous to correct or improve it by an attention to what is advanced by his opponents.
Thomas Malthus
Religion is essentially the art and the theory of the remaking of man. Man is not a finished creation.
Edmund Burke
Even for practical purposes theory generally turns out the most important thing in the end.
Oliver Wendell Holmes
Your theory is crazy, but it's not crazy enough to be true.
Niels Bohr
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.
Niels Bohr
I have a theory that the best ads come from personal experience. Some of the good ones I have done have really come out of the real experience of my life, and somehow this has come over as true and valid and persuasive.
David Ogilvy
Philosophy is not a theory but an activity.
Ludwig Wittgenstein
It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong.
Richard P. Feynman
Scientific views end in awe and mystery, lost at the edge in uncertainty, but they appear to be so deep and so impressive that the theory that it is all arranged as a stage for God to watch man's struggle for good and evil seems inadequate.
Richard P. Feynman
The struggle for existence holds as much in the intellectual as in the physical world. A theory is a species of thinking, and its right to exist is coextensive with its power of resisting extinction by its rivals.
Thomas Huxley
Science is organized common sense where many a beautiful theory was killed by an ugly fact.
Thomas Huxley
Creationists make it sound as though a 'theory' is something you dreamt up after being drunk all night.
Isaac Asimov
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