Medina is a powerful arguer, but plainly something has gone very wrong. He is trying to think of probable and more probable by analogy with safe and safer and also sees probable as meaning something like approvable—as its etymology might suggest. But the case he is dealing with is that of a probable opinion and, its opposite, which is more probable. This is completely impossible on a usual understanding of probable, since if the opposite of a proposition is more probable than it, then the proposition itself is not probable but improbable. But this is only so if probable is taken to mean, as it
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