In this paper, I argue for the Hidden Grounds thesis: in paradigmatic cases of religious hinge commitments, these commitments are rational in virtue of being implicitly based on epistemic grounds. The key intuition behind my argument draws on the work of John Henry Newman. As I understand him, Newman holds that both religious and non-religious hinges are rational because they are grounded in epistemic considerations that are largely implicit and not necessarily accessible to reflection. This, in turn, explains their epistemic stability. I begin by presenting the argument for the Hidden Grounds thesis. The subsequent sections support the premises of this argument. First, I introduce the concept of implicit basing and argue that some doxastic states are rational in virtue of being implicitly based on epistemic grounds. I then present Newman’s view on the implicit grounds of religious hinges and argue for its plausibility. I conclude by addressing several possible objections to my view.
