Action Quote by Tehyi Hsieh

Action will remove the doubt that theory cannot solve

— Pehyl Hsieh

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

— Jean-Martin Charcot

Whenever a theory appears to you as the only possible one, take this as a sign that you have neither understood the theory nor…

— Karl Popper

Without theory there is nothing to modify or learn.

— W. Edwards Deming

You can never tell what will happen to a theory before you can get around to using it.

— Josephine Lawrence

When that theory is isolated from known facts, it is likely not to be productive.

— Patricia Churchland

When the fact doesn't meet the theory then let go the theory.

— Agatha Christie

Never abandon a theory that explains something until you have a theory that explains more.

— John McCarthy

Never worry about theory as long as the machinery does what it's supposed to do.

— Robert A. Heinlein

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

— Francis Crick

Theory can leave questions unanswered, but practice has to come up with something.

— Mason Cooley

The truth of a theory can never be proven, for one never knows if future experience will contradict its conclusions.

— Albert Einstein