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An ounce of action is worth a ton of theory.

At the present day the crude theory of the sexual impulse held on one side, and the ignorant rejection of theory altogether on the other side, are beginning to be seen as both alike unjustified.

Havelock Ellis

America traditionally represents the greatest possibility of someone's going from nothing to something. Why? In theory, if not practice, the government stays out of the way and lets individuals take risks and reap rewards or accept the consequences of failure. We call this capitalism - or, at least, we used to.

There could be no fairer destiny for any physical theory than that it should point the way to a more comprehensive theory in which it lives on as a limiting case.

Albert Einstein

Destiny

Theory

I have just got a new theory of eternity.

Albert Einstein

Eternity

Theory

If the facts don't fit the theory, change the facts.

A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.

Manfred Eigen

Theory

A theory has only the alternative of being right or wrong. A model has a third possibility: it may be right, but irrelevant.

In theory, there is no difference between theory and practice. But, in practice, there is.

It is also a good rule not to put overmuch confidence in the observational results that are put forward until they are confirmed by theory.

If your theory is found to be against the second law of theromodynamics, I give you no hope; there is nothing for it but to collapse in deepest humiliation.

I hesitate to predict whether this theory is true. But if the general opinion of Mankind is optimistic then we're in for a period of extreme popularity for science fiction.

While gossip among women is universally ridiculed as low and trivial, gossip among men, especially if it is about women, is called theory, or idea, or fact.

They do not merely collect texts; they must also gather data about the context and the informant and, above all, write an analysis of the items based upon the course readings and lecture material on folklore theory and method.

Alan Dundes

Theory

The theory of cultural bias... is the idea that a culture is based on a particular form of organization. It can't be transplanted except to another variant of that organization.