Arthur C. Clarke Quotes

Argument is conclusive, but it does not remove doubt, so that the mind may rest in the sure knowledge of the truth, unless it finds it by the method of experiment.

A proof tells us where to concentrate our doubts.

The first precept was never to accept a thing as true until I knew it as such without a single doubt.

Supposing is good, but finding out is better.

I don't have to have faith, I have experience.

Do you know because I tell you so, or do you know, do you know.

I think it will be found that experience, the true source and foundation of all knowledge, invariably confirms its truth.

Who never doubted, never half believed. Where doubt is, there truth is - it is her shadow.

Any truth is better than indefinite doubt.

Certitude is not the test of certainty. We have been cocksure of many things that are not so

Doubt, indulged and cherished, is in danger of becoming denial; but if honest, and bent on thorough investigation, it may soon lead to full establishment of the truth.

A thing that nobody believes cannot be proved too often.

Knowing is higher than believing. Knowing means that there is NO doubt.

Carl did not want to believe. He wanted to know.

The word of knowledge, strictly employed, implies three things: truth, proof, and conviction.

I know that this story is true.

Suspecting and knowing are not the same.

Certainty is no guarantor of correctness.

...and when is enough proof enough?

Il n'est pas certain que tout soit incertain. (Translation: It is not certain that everything is uncertain.)

Guessing isn't knowing.

I just wanted to be sure of you.

Even though there are no ways of knowing for sure, there are ways of knowing for pretty sure.

A thing is not proved because no one has ever questioned it... Skepticism is the first step toward truth.

Truth is what stands the test of experience.