Contradiction Quote by L. E. J. Brouwer

If you claim to have a theory that deduces unexpected consequences from nontrivial principles, let's see it.

— Noam Chomsky

A theory should not attempt to explain all the facts, because some of the facts are wrong

— Francis Crick

Theory, from whatever source, is not perfect until it is reduced to practice.

— Hosea Ballou

The current situation with regard to theory is odd and maybe defined by a paradox.

— Simon Critchley

The only thing that permits us to acquiesce in an erroneous theory is the lack of a better one, analogously, an injustice is tolerable…

— John Rawls

A theory which is not refutable by any conceivable event is non-scientific. Irrefutability is not a virtue of a theory (as people often think)…

— Karl Popper

Theory is good; but it doesn't prevent things from existing.

— Jean-Martin Charcot

The idea that the sole aim of punishment is to prevent crime is obviously grounded upon the theory that crime can be prevented, which…

— H. L. Mencken

“An 'established principle' is the one which will never become untrue, irrespective of time.”

— Dada Bhagwan

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

— Manfred Eigen

If we have a correct theory but merely prate about it, pigeonhole it and do not put it into practice, then that theory, however…

— Mao Zedong

“It all comes down to this: Whenever theory supersedes evidence, and prejudice deposes rationalism, there can be no real justice.”

— John E. Douglas