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.
Theories are like scaffolding: they are not the house, but you cannot build the house without them.
The best practice is inspired by theory.
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.
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.
It is the theory that decides what can be observed.
I have a theory that the truth is never told during the nine-to-five hours.
A theory in its day helps to solve the problems of the day.
The theory of Communism may be summed up in one sentence: Abolish all private property.
It is not enough for theory to describe and analyze, it must itself be an event in the universe it describes. In order to do this theory must partake of and become the acceleration of this logic. It must tear itself from all referents and take pride only in the future. Theory must operate on time at the cost of a deliberate distortion of present reality.
My theory of evolution is that Darwin was adopted.
Never worry about theory as long as the machinery does what it's supposed to do.
To understand theory is not enough. Much practice is necessary.
Democracy is beautiful in theory; in practice it is a fallacy.
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.
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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