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Every theory presented as a scientific concept is just that; it's a theory that tries to explain more about the world than previous theories have done. It is open to being challenged and to being proven incorrect.

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.

Theory helps us to bear our ignorance of facts.

Science is a self-correcting discipline that can, in subsequent generations, show that previous ideas were not correct.

But that the reasoning from these facts, the drawing from them correct conclusions, is a matter of great difficulty, may be inferred from the imperfect state in which the Science is now found after it has been so long and so intensely studied.

I'm not sure what theory is, unless it's the pursuit of fundamental questions.

A good scientific theory is one which is falsifiable, which has not been falsified.

There can be theory but, you know, the problem is you've got to be able to test it. So theories are one thing, testing is another.

When all is said and done, science actually takes hard work and a willingness to sometimes find out that your most cherished hypothesis is wrong.

It really is a nice theory. The only defect I think it has is probably common to all philosophical theories. It's wrong.