Uncle Jack must have been a carpenter, as he continually “hits the nail squarely on the head.” From Mere Christianity:
If anyone thinks that Christians regard unchastity as the supreme vice, he is quite wrong. The sins of the flesh are bad, but they are the least bad of all sins. All the worst pleasures are purely spiritual: the pleasure of putting other people in the wrong, of bossing and patronising and spoiling sport, and back-biting, the pleasures of power, of hatred. For there are two things inside me, competing with the human self which I must try to become. They are the Animal self, and the Diabolical self. The Diabolical self is the worse of the two. That is why a cold, self-righteous prig who goes regularly to church may be far nearer to hell than a prostitute. But, of course, it is better to be neither.
I’m afraid Uncle Jack was a smidge off hitting this particular nail squarely. The generalization with which he opened this excerpt is wrong; most Christians do regard unchastity as the supreme vice, completely missing the the attitudinal sins Lewis mentions later on. Even if you’re reborn into a new person by faith in Jesus’ bloody sacrifice on the cross and subsequent resurrection, you still have to deal with the sin-habit you’ve developed over the years before you came to faith.
When we’re first saved we all marvel at the sensation that freedom from sin-guilt gives us. But just as all changes become mundane after a while, we begin taking the freedom that Jesus so dearly bought for granted. The sensation fades, as does our revulsion to sin, and (name your poison) doesn’t seem so bad after all.
I love Lewis’ categories of sin: Animal, and Diabolical. Or, maybe I should say I hate them, as I recognize their icky feelers trying to creep into my life. All that stands in the way of those embryonic buggers is God’s Holy Spirit working through his Word and prayer; no Word, no prayer, no protection.
Any sin, regardless how slight, if unconfessed, will open the door for those buggers. And diabolical sins of attitude are the worst because they’re almost invisible.
Do you think you’re free from attitudinal sin? That’s the primary symptom of having a bad case of them. Think of homeowners; termites are never a problem until the homeowners get their house inspected by the pros. Attitudinal sin is even more destructive than termites, and God’s Holy Spirit is the Pro you need to consult for finding those diabolical, soul-chewing sin-buggers.
If you’re not read-up and prayed-up, you’ll soon become fed-up with your lackluster Christian walk. You may hang onto “a form of godliness,” but your profession will be a lie.