There is no such uncertainty as a sure thing.

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History is a living horse laughing at a wooden horse. History is a wind blowing where it listeth. History is no sure thing to bet on. History is a box of tricks with a lost key. History is a labyrinth of doors with sliding panels, a book of ciphers with the code in a cave of the Saragossa sea. History says, if it pleases, Excuse me, I beg your pardon, it will never happen again if I can help it.

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The only sure thing about luck is that it will change.

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The pepper-box: what a lovely little instrument. Once a man went so far as to pull the trigger, all bets were off. It might discharge one chamber, or two, or all might go. The only sure thing was that that there was no safe place to be but behind it.

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The man who goes farthest is generally the one who is willing to do and dare. The sure-thing boat never gets far from shore.

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Death is the only inescapable, unavoidable, sure thing. We are sentenced to die the day we're born.

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There is nothing so uncertain as a sure thing.

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Yes, risk-taking is inherently failure-prone. Otherwise, it would be called sure-thing taking.

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