"I don’t feel guilty."

People often don’t feel guilty when they sin because they have "seared" their conscience. They have removed the batteries from the smoke detector of their conscience, so that they can sin without interruption. The way to resurrect a deadened conscience is to go through each of the Ten Commandments, reminding the person that they know that it’s wrong to lie, steal, commit adultery, etc. Always preach the Law along with future punishment, then pray that the Holy Spirit will come upon them and cause them to be convicted of sin, righteousness, and judgment to come.

"You are trying to make me feel guilty by quoting the Ten Commandments."

Ask the person which one of the Ten Commandments makes him feel guilty. Simply state, "The Bible says, ‘You shall not steal.’ If you feel guilty when you hear that, why do you think that is? Could it be because you are guilty?" God gave us our conscience so we would know when we break His Law; the guilt we feel when we do something wrong tells us that we need to repent. See also Romans 2:15 footnote.