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— Brian Tracy"All great success and achievement is preceded and accompanied by hard, hard, work. When in doubt, 'try harder.' And if that doesn't work, try harder still!"
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There can be no doubt that the knowledge of logic is of considerable practical importance for everyone who desires to think and to infer correctly.
— Alfred Tarski
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Should I perchance still feel after my death, I would no longer have any doubt, but I would most certainly give the lie to anyone asserting before me that I was dead.
— Giacomo Casanova
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