What men really want is not knowledge but certainty. Bertrand Russell
No great deed is done by falterers who ask for certainty. George Eliot
If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts, he shall end in certainties. Francis Bacon
Certainty? In this world nothing is certain but death and taxes. Benjamin Franklin
Doubt is not a pleasant condition, but certainty is absurd. Voltaire
Fear comes from uncertainty. When we are absolutely certain, whether of our worth or worthlessness, we are almost impervious to fear. William Congreve
The quest for certainty blocks the search for meaning. Uncertainty is the very condition to impel man to unfold his powers. Erich Fromm
For my part I know nothing with any certainty, but the sight of the stars makes me dream. Vincent van Gogh