In Ephesians 4:17–32, the Apostle Paul turns from explaining the gospel (Eph 1-3) to showing how the gospel reshapes everyday life. Writing to new Gentile believers who had come to faith in Christ, Paul reminds them that conversion is not merely a change of beliefs but a change of identity. Because they have been made new in Christ, their thinking, speaking, relationships, and habits are all to reflect that new reality. In this passage, Paul calls Christians to “put off” the old way of life and “put on” the new — not in order to earn God’s grace, but because they have already received it.