https://www.mljtrust.org/sermons-online/acts-2-37-42/a-new-creation-2/

Christianity is not a costume. It is not something that is added on top of a life of sin, or in place of previous practices. Christians are not people with refined manners and cleaner conversations. As Dr. Martyn Lloyd-Jones explains in this sermon on Acts 2:37–42, “If anyone is in Christ, he is a new creation.” All who repent of their sin and believe in Jesus are born again into the family of God. More than a new set of rules, it is a new identity; an entirely new person with a longing for holiness and an increasing hatred for sin. This is life transformation, but it comes at a cost. Christians are often forcibly removed from prior social circles and seen as judgmental and traditionalistic. The gospel opposes humanity’s natural desire, which is to pursue self above all else. Listen as Dr. Lloyd-Jones provides a correct diagnosis of humanity’s self-perceived free thinking that is either in subjection to the devil or to God. There is no middle ground. What a person does reveals where their faith and hope truly rest. The choice is clear: either serve God and know the joy to true transformation, or serve self and reap the disaster of eternal punishment.