Alston's overall aim in Perceiving God is to show that we are rationally justified in believing that our apparent direct perceptions of God's presence (called ‘M-experiences’) are reliable and thus for the most part veridical, the objective, existentially-committed beliefs based on these experiences thereby being prima facie justified, subject to defeat by certain overriders supplied by some background religion. It is argued that our rational justification for believing this is of both an epistemic and pragmatic (or practical) sort, in which an epistemic reason for believing a proposition is truth conducive, rendering the proposition probable, while a pragmatic one concerns the benefits which accrue from belief. We will begin by considering the pragmatic justification, since the case he makes out for epistemic justification is built on its back.