Some people don’t feel guilty when they sin because they have “seared” their conscience. Repeated sin sears the conscience until its muffled voice is no longer heard. This is a tragedy because the conscience in the voice of warning. Those who delight in sin, because they have dulled their conscience, are like a man who removes the batteries from his smoke detector because he doesn’t want to be bothered by its alarm.
To awaken a deadened conscience, simply take the person through the Law. Address the conscience directly by saying, “You know it’s wrong to lie, steal, commit adultery, etc.” As you do so, the conscience will confirm the truth of the Commandments. Always preach the Law along with future punishment, then pray that the Holy Spirit will come convict the person of sin, righteousness, and judgment to come.
Ephesians 4:19 who, being past feeling, have given themselves over to lewdness, to work all uncleanness with greediness.