 The Preface to the second edition begins with a discussion of the Religion’s title, which as Kant explains, is meant to depict two overlapping domains, the “wider sphere of faith” and the “narrower” sphere of the “pure religion of reason” (AK 6:12). Kant then writes that from “this standpoint I can also make this second experiment” (zweiten Versuch), without, however, explicitly enumerating a “first experiment”.