Certainty Quote by Andreas Vesalius

I have throughout been curious about how much we can be said to know and with what degree of certainty or doubtfulness.

— 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

The only certainty is that nothing is certain.

— Pliny the Elder

In these matters the only certainty is that nothing is certain.

— Pliny the Elder

The only certainty is uncertainty

— Pliny the Elder

Nothing is certain by uncertainty.

— Gilbert K. Chesterton

A few observation and much reasoning lead to error; many observations and a little reasoning to truth.

— Alexis Carrel

To know much is often the cause of doubting more.

— Michel de Montaigne

No matter how many times something has been observed, it cannot be believed until it has been observed again.

— Halton Arp

All that belongs to human understanding, in this deep ignorance and obscurity, is to be sceptical, or at least cautious, and not to admit…

— David Hume

The minute one utters a certainty, the opposite comes to mind.

— May Sarton