Work hard, then, on the disappointment or anticlimax which is certainly coming to the patient during his first few weeks as a churchman. The Enemy allows this disappointment to occur on the threshold of every human endeavour. It occurs when the boy who has been enchanted in the nursery by Stories from the Odyssey buckles down to really learning Greek. It occurs when lovers have got married and begin the real task of learning to live together. In every department of life it marks the transition from dreaming aspiration to laborious doing. The Enemy takes this risk because He has a curious fantasy of making all these disgusting little human vermin into what He calls His “free” lovers and servants—”sons” is the word He uses, with His inveterate love of degrading the whole spiritual world by unnatural liaisons with the two-legged animals. Desiring their freedom, He therefore refuses to carry them, by their mere affections and habits, to any of the goals which He sets before them: He leaves them to “do it on their own”. And there lies our opportunity. But also, remember, there lies our danger. If once they get through this initial dryness successfully, they become much less dependent on emotion and therefore much harder to tempt.
from The Scewtape Letters by C.S. Lewis