In the second half of Ephesians 4 we see Paul picking up on the theme he introduced in verse 1 - "to live a life worthy of the calling you have received". In the first half of the chapter he speaks about Christian unity. As he continues in this passage he shifts his focus to Christian purity. In this talk we think about why and how Christians change as we consider Paul's two main emphases of knowing who you are in Christ, and then being who you are in Christ.