Doubt is not a very agreeable status, but certainty is a ridiculous one.
Absolute certainty is a privilege of uneducated minds and fanatics. - It is, for scientific folk, an unattainable ideal.
The person with the most certainty in a given situation will influence the other.
I believe faith is not certainty but the courage to live with uncertainty.
A man who has humility will have acquired in the last reaches of his beliefs the saving doubt of his own certainty.
One thing, however, I know with certainty: violence, or the direct threat of violence, of the kind we have seen in the past few days, is totally unjustified as a response to any published word or image.
If men would only take the chances of doing right because it is right, instead of the immediate certainty of the advantage of doing wrong, how much happier would their lives be.
I am not accustomed to saying anything with certainty after only one or two observations.
Even the stoics agree that certainty is very hard to come at; that our assent is worth little, for where is infallibility to be found?
Deep down in everyone was sorrow and certainty.
Perseverance is more than endurance. It is endurance combined with absolute assurance and certainty that what we are looking for is going to happen.
Madness is the result not of uncertainty but certainty.
I do know something. Just not with any certainty.
Vast ills have followed a belief in certainty.
Know with certainty that there is a God, and that there exists a world beyond this one - the world of souls.
I imagine having that sixth sense, the certainty that what I'm looking for is within reach, even if it's still hidden.
Slender certainty is better than portentous falsehood.
Discovering, for example, that as witnesses to your life diminish, there is less corroboration, and therefore less certainty, as to what you are or have been. [p. 65]
Somewhere in the back of my brain there exists this certainty: The body is no more than a costume, and can be changed at will. That the changing of bodies, like costumes, would make me into a different character, a character who might, finally, be alright.
One must verify or expel his doubts, and convert them into the certainty of Yes or NO.