My dear Wormwood,
I note with grave displeasure that your patient has become a Christian. Do not indulge the hope that you will escape the usual penalties; indeed, in your better moments, I trust you would hardly even wish to do so. In the meantime we must make the best of the situation. There is no need to despair; hundreds of these adult converts have been reclaimed after a brief sojourn in the Enemy’s camp and are now with us. All the habits of the patient, both mental and bodily, are still in our favour.
One of our great allies at present is the Church itself. Do not misunderstand me. I do not mean the Church as we see her spread out through all time and space and rooted in eternity, terrible as an army with banners. That, I confess, is a spectacle which makes our boldest tempters uneasy. But fortunately it is quite invisible to these humans. All your patient sees is the half-finished, sham Gothic erection on the new building estate. When he goes inside, he sees the local grocer with rather an oily expression on his face bustling up to offer him one shiny little book containing a liturgy which neither of them understands, and one shabby little book containing corrupt texts of a number of religious lyrics, mostly bad, and in very small print. When he gets to his pew and looks round him he sees just that selection of his neighbours whom he has hitherto avoided. You want to lean pretty heavily on those neighbours. Make his mind flit to and fro between an expression like ‘the body of Christ’ and the actual faces in the next pew.... ....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....
Your affectionate uncle
C.S. Lewis, The Screwtape Letters (originally 1942; this edition: Harper Collins, 1996) 5-8.