There is no certainty; there is only adventure.
Roberto Assagioli
You should have certainty in what you do. Anyone who has done anything in this world was hated. If you're not hated, you've done nothing.
Yehuda Berg
One must verify or expel his doubts, and convert them into the certainty of Yes or NO.
Thomas Carlyle
We regard it as a certainty that the earth, enclosed between poles, is bounded by a spherical surface.
Nicolaus Copernicus
I am certain there is too much certainty in the world.
Michael Crichton
Only a very bad theologian would confuse the certainty that follows revelation with the truths that are revealed. They are entirely different things.
Denis Diderot
No one can forecast the economy with certainty.
Jamie Dimon
We can say with certainty - or 90% probability - that the new industries that are about to be born will have nothing to do with information.
Peter Drucker
Inquiry is fatal to certainty.
Will Durant
Certitude is not the test of certainty. We have been cocksure of many things that were not so.
Oliver Wendell Holmes, Jr.