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

From this bestial view that the human mind consists of only sense certainty, pleasure and pain, Locke developed an equally bestial theory of the nation. Man originally existed in a State of Nature of complete liberty.
Robert Trout

Fundamentalists are panicked by the apparent disintegration of the family, the disappearance of certainty and the decay of morality. Fear leads them to ask, if we cannot trust the Bible, what can we trust?
Garrett Hardin

Hope is definitely not the same thing as optimism. It is not the conviction that something will turn out well, but the certainty that something makes sense, regardless of how it turns out.
Vaclav Havel

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

I am certain there is too much certainty in the world.
Michael Crichton

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.
Polykarp Kusch

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.
Hans Blix

I have moved from certainty to doubt, from devotion to rebellion.
Phil Donahue

I never imagined it wouldn't work out for me. I had that absolute certainty in myself that has seen me through, I think, and my parents were absolutely behind me all the way.
Ewan McGregor

I really think that living is the process of going from complete certainty to complete ignorance.
Richard Dreyfuss

I would say that without any doubt he's the killer - the law says beyond a reasonable doubt and to a moral certainty which I - there's no question that he was the killer of President Kennedy.
Henry Wade

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

I'm not resigned, but I'm realistic too. The statistics in my case are very poor. Not many people come through esophageal cancer and live to talk about it, or not for long. And the other wager is, the part of the wager, it's a certainty you'll have a terrible time and you may wish you were dying because it's an awful process.
Christopher Hitchens

Ideas which have been developed simultaneously or in immediate succession in the same mind mutually reproduce each other, and do this with greater ease in the direction of the original succession and with a certainty proportional to the frequency with which they were together.
Hermann Ebbinghaus

If a man fights his way through his doubts to the conviction that Jesus Christ is Lord, he has attained to a certainty that the man who unthinkingly accepts things can never reach.
William Barclay

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

If I knew for a certainty that a man was coming to my house with the conscious design of doing me good, I should run for my life.
Henry David Thoreau

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!
Blaise Pascal

If you develop the absolute sense of certainty that powerful beliefs provide, then you can get yourself to accomplish virtually anything, including those things that other people are certain are impossible.
William Lyon Phelps