 With respect to the second step, some philosophers might object that logic is part of the framework within which beliefs have logical implications and can’t be part of the same system of belief itself. However, Lewis himself might have trouble with this suggestion, since he recognized the possibility of alternative logics, and presumably, any decision, even pragmatic, about the adoption or rejection of a logic must operate on some logical assumptions. In any case, Lewis himself recognizes that in principle experience could lead us to abandon logical beliefs and replace them with others. What he will deny is that it does so by making these principles empirically improbable, and thus any less a priori warranted. Arguably, he may be assuming an excessively narrow view of what makes for probability. 