Surely you have experienced it. That is, if you are anything like the rest of us. You are caught up in a wave of sin that you once believed you would never commit. Not only do you now find it acceptable, you also find it desirable. Whether this is engaging in pornography or committing adultery or abusing your husband/wife/children, something has gone wrong. Just like a broken compass fails to tell a seaman which direction he ought to go, so your moral compass has broken, and you are left wondering how this could have possibly happened to you.