 Alston develops a general theory of doxastic practices (constellations of belief-forming mechanisms, together with characteristic background assumptions and sets of defeaters), gives an account of what it is to rationally engage in such a practice, and then argues that at least the practice of forming beliefs on the basis of Christian religious experiences fulfills those requirements. If we think of the broad doxastic practices we currently employ, we see that some of them can be justified by the use of other practices. The practice of science, for example, reduces mostly to the practices of sense-perception, deductive reasoning, and inductive reasoning (memory and testimony also make contributions, of course). The justificatory status the practice gives to its product beliefs derives from those more basic practices. Most, however, cannot be so reduced. How are they justified, then? It seems that they cannot be justified non-circularly, that is, without the use of premises derived from the practices themselves. Our only justification for continuing to trust these practices is that they are firmly established, interwoven with other practices and projects of ours, and have “stood the test of time” by producing mostly consistent sets of beliefs. They produce a sufficiently consistent set of beliefs if they don’t produce massive, unavoidable contradictions on central matters, either internally, or with the outputs of other equally well-established practices. If that’s all there is to be said about our ordinary practices, then we ought to extend the same status to other practices that have the same features. He then argues that the Christian practice of belief-formation on the basis of religious experience does have those features. Like Plantinga, he admits that such an argument might be equally available to other religious practices; it all depends on whether the practice in question generates massive and unavoidable contradictions, on central matters, either internally, or with other equally well-established practices. To undermine this argument, one would have to show either that Alston’s criteria for rationality of a practice are too permissive, or that religious practices never escape massive contradictions.