Though it has substantial plausibility in connection with various derived epistemic sources such as scientific instruments, it is clear that [P1] runs afoul of the local skepticism constraint. It amounts to a demand which is in principle unsatisfiable. If, as [P1] implies, intuition must be calibrated by some other source, X, then, by [P1], X must itself be calibrated by yet another source of evidence, Y, which must itself be calibrated and so on. Some hold, in virtue of this fact, that it is im