A belief is not true simply because it is useful.
Our systems, perhaps, are nothing more than an unconscious apology for our faults, a gigantic scaffolding whose object is to hide from us our favorite sin.
The efficacy of religion lies precisely in what is not rational, philosophic, nor eternal; its efficacy lies in the unforeseen, the miraculous, the extraordinary. Thus religion attracts more devotion according as it demands more faith - that is to say, as it becomes more incredible to the profane mind.