"Use the formula P=40 to 70, in which P stands for the probability of success and the numbers indicate the percentage of information acquired. Once the information is in the 40 to 70 range, go with your gut."

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The rigidity of those pledges is something I don’t like. The circumstances change and you can’t be wedded to some formula by Grover Norquist. It’s—who the hell is Grover Norquist, anyway?

— George H. W. Bush