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- "There is a vulgar incredulity, which in historical matters, as well as in those of religion, finds it easier to doubt than to examine."
- Sir Walter Scott
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- To doubt everything or to believe everything are two equally convenient solutions; both dispense with the necessity of reflection.
- Henri Poincare
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- Doubt is the father of invention.
- Galileo
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- "Whenever man begins to doubt himself, he does something so stupid that he is reassured."
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- I wish I could be half as sure of anything as some people are of everything.
- Gerald Barzan
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