 He takes a similar approach to the Trinity: we lack a clear idea of what it is, but talk of it is significant because of its practical role in modifying the attitudes and conduct of the faithful (Alciphron, 7.8). Original sin receives a similar treatment. In general, talk of the “religious mysteries”, according to Berkeley, serves a practical function of motivating and guiding the faithful to think and act according to Christian principles. They are “placed in the will and affections rather than in the understanding, and producing holy lives rather than subtle theories” (Alciphron, 7.10).