If I am fool it is at least a doubting one and I envy no one the certainty of his self-approved wisdom.

From principles is derived probability but truth or certainty is obtained only from facts.

Truth is confirmed by inspection and delay falsehood by haste and uncertainty.

I trust every single person around me and if I feel even a whiff of uncertainty I won't have that person around me.

If you just watch a teenager you see a lot of uncertainty.

Read the news section of the newspaper and there is confusion and uncertainty a world buffeted by large forces people neither understand nor control. But turn to the sports section and it's all different.

Science has proof without any certainty. Creationists have certainty without any proof.

Adventure upon all the tickets in the lottery and you lose for certain and the greater the number of your tickets the nearer your approach to this certainty.

I'm a scientist not a theologian. I don't know if there is a God or not. Religion requires certainty.

If we must not act save on a certainty we ought not to act on religion for it is not certain. But how many things we do on an uncertainty sea voyages battles!

The power of the lawyer is in the uncertainty of the law.

I never appreciated 'positive heroes' in literature. They are almost always cliches copies of copies until the model is exhausted. I prefer perplexity doubt uncertainty not just because it provides a more 'productive' literary raw material but because that is the way we humans really are.

Unfortunately poetry is not born in noise in crowds or on a bus. There have to be four walls and the certainty that the telephone will not ring. That's what writing is all about.

Although our intellect always longs for clarity and certainty our nature often finds uncertainty fascinating.

The fastest way to break the cycle of perfectionism and become a fearless mother is to give up the idea of doing it perfectly - indeed to embrace uncertainty and imperfection.

The unique and supreme voluptuousness of love lies in the certainty of committing evil. And men and women know from birth that in evil is found all sensual delight.

Probability is expectation founded upon partial knowledge. A perfect acquaintance with all the circumstances affecting the occurrence of an event would change expectation into certainty and leave nether room nor demand for a theory of probabilities.

I feel sometimes as the renaissance man must have felt in finding new riches at every point and in the certainty that unexplored areas of knowledge and experience await at every turn.

I found it peculiar that those who wanted to take military action could - with 100 per cent certainty - know that the weapons existed and turn out to have zero knowledge of where they were.

Knowledge is an unending adventure at the edge of uncertainty.

Dogmatism and skepticism are both in a sense absolute philosophies one is certain of knowing the other of not knowing. What philosophy should dissipate is certainty whether of knowledge or ignorance.

Jealousy lives upon doubts. It becomes madness or ceases entirely as soon as we pass from doubt to certainty.

Sooner or later you must move down an unknown road that leads beyond the range of the imagination and the only certainty is that the trip has to be made.

Hope is not the conviction that something will turn out well but the certainty that something makes sense regardless of how it turns out.