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| Men whose lives are doubtful want a strong government and a hot religion | | Elbert Hubbard | |
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| Our doubts are traitors and make us lose the good we oft might win, by fearing to attempt | | William Shakespeare | |
| The first precept was never to accept a thing as true until I knew it as such without a single doubt. | | Rene Descartes | |
| There is nothing more difficult to carry out, nor more doubtful of success, nor more dangerous to handle, that to institute a new order of things | | Niccolo Machiavelli | |
| There is nothing more dreadful than the habit of doubt. Doubt separates people. It is a poison that disintegrates friendships and breaks up pleasant relations. It is a thorn that irritates and hurts; it is a sword that kills. | | Buddha | |
| There's naught, no doubt, so much the spirit calms as rum and true religion | | Lord Byron | |
| Those who have no power to judge of past times but by their own, should always doubt their conclusions | | Samuel Johnson | |
| Throughout the long period of religious doubt, I had been rendered very unhappy by the gradual loss of belief, but when the process was completed, I found to my surprise that I was quite glad to be done with the whole subject | | Bertrand Russell | |
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| We degenerate into hideous puppets, haunted by the memory of the passions of which we were much afraid, and the exquisite temptations that we had not the courage to yield to. | | Oscar Wilde | |
| We demand rigidly defined areas of doubt and uncertainty! | | Douglas Adams | |
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| Who never doubted, never half believed. Where doubt is, there truth is - it is her shadow. | | Ambrose Bierce | |
