As long as he retains externally the habits of a Christian he can still be made to think of himself as one who has adopted a few new friends and amusements but whose spiritual state is much the same as it was six weeks ago. And while he thinks that, [he will not repent] of a definite, fully recognized, sin, ... only [vaguely and uneasily] feeling that he hasn't been doing very well lately... If such a feeling is allowed to live... it increases reluctance to think about [God]. All humans at nearly all times have some such reluctance; but when thinking of Him involves facing and intensifying a whole vague cloud of half-conscious guilt, this reluctance is increased tenfold. They hate every idea that suggests Him, just as men in financial embarrassment hate the very sight of a bankbook. In this state... {man] will increasingly dislike his religious duties. He will think about them as little as he feels he decently can beforehand, and forget them as soon as possible when they are over. He will want his prayers to be unreal, for he will dread nothing so much as effective contact with [his Heavenly Father]... Uneasiness and his reluctance to face it cut him off more and more from all real happiness...
C.S. Lewis, The Screwtape Letters
prayer, rationalization, religious-duty, sin