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| A person who doubts himself is like a man who would enlist in the ranks of his enemies and bear arms agains himself. He makes his failure certain by himself being the first person to be convinced of it. | | Ambrose Bierce | |
| And who can doubt that it will lead to the worst disorders when minds created free by God are compelled to submit slavishly to an outside will? When we are told to deny our senses and subject them to the whim of others? When people devoid of whatsoever competence are made judgesover experts and are granted authority to treat them as they please?These are the novelties which are apt to bring about the ruin ofcommonwealths and the subversion of the state. | | Galileo Galilei | |
| As to the Adjective; when in doubt, strike it out | | Mark Twain | |
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| Doubt is a pain too lonely to know that faith is his twin brother. | | Kahlil Gibran | |
| Doubt is not a pleasant condition but certainty is an absurd one. | | Voltaire | |
| Doubt is not a pleasant condition, but certainty is absurd | | Voltaire | |
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| Doubt is the vestibule through which all must pass before they can enter into the temple of wisdom. | | Charles Caleb Colton | |
| Doubt is uncomfortable, certainty is ridiculous. | | Voltaire | |
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| Doubts and mistrust are the mere panic of timid imagination, which the steadfast heart will conquer, and the large mind transcend. | | Helen Keller | |
Dubito ergo cogito; cogito ergo sum.
(I doubt, therefore I think; I think therefore I am) | | Rene Descartes | |
| Four be the things I'd have been better without: love, curiosity, freckles and doubt. | | Dorothy Parker | |
| Here undoubtedly lies the chief poetic energy: --in the force of imagination that pierces or exalts the solid fact, instead of floating among cloud-pictures. | | T.S. Eliot | |
| I hope that your committee will not permit doubt as to constitutionality, however reasonable, to block the suggested legislation (the Guffey Coal Control Bill) | | Franklin D. Roosevelt | |
| I respect faith but doubt is what gets you an education | | Wilson Mizner | |
| Just think of the tragedy of teaching children not to doubt. | | Clarence Darrow | |
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