Certainty Quote by Bertrand Russell

What can we say with certainty?

— Voltaire

In my life, the only certainty is to be uncertain. I'm an unbeliever who believes in skepticism. I'm only sure about being unsure.

— Christopher Hitchens

Is there any knowledge in the world which is so certain that no reasonable man could doubt it?

— Bertrand Russell

We are not certain, we are never certain. If we were we could reach some conclusions, and we could, at last, make others take…

— Benjamin Franklin

“In order to determine whether we can know anything with certainty, we first have to doubt everything we know”

— Anonymous

I don't believe anything. I only know some things to a greater degree of certainty than others.

— John Ryman

When one admits that nothing is certain one must, I think, also admit that some things are much more nearly certain than others. It…

— Bertrand Russell

I am not accustomed to saying anything with certainty after only one or two observations.

— Andreas Vesalius

I know nothing but the certainty of my own ignorance.

— Socrates

Doubt is long-winded. Certainty is brief.

— Mason Cooley

To know much is often the cause of doubting more.

— Michel de Montaigne

Absolute certainty is a privilege of uneducated minds and fanatics. - It is, for scientific folk, an unattainable ideal.

— Cassius Jackson Keyser