Doubt And Certainty Quotes by Bertrand Russell, Oliver Wendell Holmes, Jr., Wilson Mizner, William Shakespeare, Francis Bacon, Ernest Holmes and many others.

Fools and fanatics are always so certain of themselves.
To have doubted one’s own first principles is the mark of a civilized man.
I respect faith, but doubt is what gets you an education.
Modest doubt is called the beacon of the wise.
If a man will begin with certainties, he shall end in doubts, but if he will content to begin with doubts, he shall end in certainties.
When prayer removes distrust and doubt and enters the field of mental certainty, it becomes faith; and the universe is built on faith.
Doubt is not a pleasant condition, but certainty is absurd.
If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.
both doubt and certainty are as contagious as the common cold
Not to be absolutely certain is, I think, one of the essential things in rationality.
Isn’t it the moment of most profound doubt that gives birth to new certainties? Perhaps hopelessness is the very soil that nourishes human hope; perhaps one could never find sense in life without first experiencing its absurdity.
Ignorance more frequently begets confidence than does knowledge.
It is the dull man who is always sure, and the sure man who is always dull.
The opposite of faith is not doubt, it’s certainty.
The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts.
Doubt is to certainty as neurosis is to psychosis. The neurotic is in doubt and has fears about persons and things; the psychotic has convictions and makes claims about them. In short, the neurotic has problems, the psychotic has solutions.
To believe with certainty, we must begin with doubting.
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