I respect faith, but doubt is what gives you an education. Wilson Mizner
The only limit to our realization of tomorrow will be our doubts of today. Franklin D Roosevelt
The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts. Bertrand Russell
If you doubt yourself, then indeed you stand on shaky ground. Henrik Ibsen
A person who doubts himself is like a man who would enlist in the ranks of his enemies and bear arms against himself. He makes his failure certain by himself being the first person to be convinced of it. Ambrose Bierce
Men become civilized, not in proportion to their willingness to believe, but in proportion to their readiness to doubt. Ambrose Bierce
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. Rene Descartes
Doubt is part of all religion. All the religious thinkers were doubters. Isaac Bashevis Singer
Beliefs are what divide people. Doubt unites them. Peter Ustinov
Doubts are more cruel than the worst of truths. Moliere (Jean Baptiste Poquelin)
When unhappy, one doubts everything; when happy, one doubts nothing. Joseph Roux
Doubt, it seems to me, is the central condition of a human being in the twentieth century. Salman Rushdie
There is no weariness like that which rises from doubting, from the perpetual jogging of unfixed reason. Robert South.
The greater the artist, the greater the doubt. Perfect confidence is granted to the less talented as a consolation prize. Robert Hughes