C.s. Lewis said this quote

“ 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...And while he thinks that, we do not have to contend with the explicit repentance of a definite, fully recognised, sin, but only with his vague, though uneasy, feeling that he hasn’t been doing very well lately. This dim uneasiness needs careful handling. If it gets too strong it may wake him up...if you suppress it entirely...we lose an element in the situation which can be turned to good account. If such a feeling is allowed to live, but not allowed to become irresistible and flower into real repentance, it has one invaluable tendency. It increases the patient’s reluctance to think about the Enemy. 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...In this state your patient will not omit, but he will increasingly dislike, his religious duties...He will want his prayers to be unreal, for he will dread nothing so much as effective contact with the Enemy. ”