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I beseech you, in the bowels of Christ, think it possible that you may be mistaken. --Oliver Cromwell

Cromwell's rule, named by statistician Dennis Lindley,[1] states that the use of prior probabilities of 0 or 1 should be avoided, except when applied to statements that are logically true or false. For instance, Lindley would allow us to say that Pr(2+2 = 4) = 1, where Pr represents the probability. In other words, arithmetically, the number 2 added to the number 2 will certainly equal 4.

in: Cromwell's rule, from Wikipedia

Submitted by Paul Alper