In making theories, always keep a window open so that you can throw one out if necessary.
Let us work without theorizing, tis the only way to make life endurable.
A professor must have a theory as a dog must have fleas.
A young man is a theory, an old man is a fact.
The world is poisoned with erroneous theories, and needs to be taught sane doctrines, but it is difficult to straighten what has become crooked.
The evolution theory is purely the product of the imagination.
It is a capital mistake to theorize before one has data.
Set theory in sheep's clothing.
Cranks live by theory, not by pure desire. They want votes, peace, nuts, liberty, and spinning-looms not because they love these things, as a child loves jam, but because they think they ought to have them. That is one element which makes the crank.
The invisible government [bosses] is malign. But the evil doesn't come from the fact that it plays horse with the Newtonian theory of the constitution. What is dangerous about it is that we do not see it, cannot use it, and are compelled to submit to it.
The theory of the teacher with all these immigrant kids was that if you spoke English loudly enough they would eventually understand.
It is certainly not the least charm of a theory that it is refutable.
Life is not theory. It is reality, with inherent duties to everything and everyone.
A man is never more satisfied than when he is confirming a favorite theory.
It is so much easier to talk of poverty than to think of the poor, to argue the rights of capital than to see its results. Pretty soon we come to think of the theories and abstract ideas as things in themselves.
Ten geographers who think the world is flat will tend to reinforce each other's errors ... Only a sailor can set them straight.
Forms of government are forged mainly in the fire of practice, not in the vacuum of theory. They respond to national character and to national realities.
The theory of war as an apt and proportionate means of solving international conflicts is now out of date.
Action will remove the doubts that theory cannot solve.
It is human to search for the theory of everything and it is superhuman to find it.
Today's practicality is often no more than the accepted form of yesterday's theory.
The present state of atomic theory is characterized by the fact that we not only believe the existence of atoms to be proved beyond a doubt, but also we even believe that we have an intimate knowledge of the constituents of the individual atoms.
No one but a theorist believes his theory; everyone puts faith in a laboratory result but the experimenter himself.
[When thinking about the new relativity and quantum theories] I have felt a homesickness for the paths of physical science where there are ore or less discernible handrails to keep us from the worst morasses of foolishness.
Asked in 1919 whether it was true that only three people in the world understood the theory of general relativity, [Eddington] allegedly replied: "Who's the third?"
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