That is behavior modification. When I understood who Jesus Christ was, it totally changed me as a person on the inside. One primary objective in many of Paul's letters was to help Christians realize when a Christian understood Jesus Christ, it changed him or her on the inside. Understanding Jesus Christ changes the person. Because he or she is not the same person.
Outside actions change because the inside person changed.
That is what happened to Paul. Conversion changed him inside. Suppose you had one of these opportunities. I understand what I am saying is impossible, but pretend for a moment it is possible. You are guaranteed that God will never know.