Certain Quote by Richard Dawkins

You can't prove that something doesn't exist. You can only prove that something does exist.

— John Connolly

By knowing things that exist, you can know that which does not exist.

— Miyamoto Musashi

The only certainty is that nothing is certain.

— Pliny the Elder

Simply because you do not have evidence that something exists does not mean that you have evidence that it doesn't exist.

— Donald Rumsfeld

We live in this realm where things exist but we pretend they don't exist, so that makes them, you know, nonexistent.

— Dominique Jackson

It is not that there are no certainties, it is that it is an absolute certainty that there are no certainties.

— Christopher Hitchens

When nothing is sure, everything is possible.

— Margaret Drabble

The only thing we can be certain of in this life is that we can be certain of nothing.

— Albert Einstein

... you could claim that anything's real if the only basis for believing in it is that nobody's proved it doesn't exist!

— J. K. Rowling

“One the grand paradoxes of existence and nonexistence is the uncertainty of uncertainty. Even uncertainty can be uncertain. However, can you be certain of…

— Lionel Suggs

The interest I have to believe a thing is no proof that such a thing exists.

— Voltaire

The only certainty is that there is no certainty.

— Robert Rubin