Paul’s letter to the Ephesian Christians could be divided into two halves: Truths about our identity and challenges to our behavior. Only when we grasp who God says we are can we live out that identity. In chapter 4, Paul pivots from talking about who we are to “how we are.” He motivates not with fear or guilt but with the calling all believers share: The good news of God’s grace in the gospel. (Phil. 1:27)