“Therefore be imitators of God, as beloved children. And walk in love, as Christ loved us and gave himself up for us …” (v1-2). As citizens of God’s kingdom, Paul urged the Ephesians to change their manner of speaking and behaving. Rough or crude joking is “out of place” for those who see other humans as image bearers of God. Sexual immorality and greedy materialism are “unfruitful works of darkness” (v11), completely opposed to our lives as “children of light” (v8).
To “walk in love” doesn’t mean that we are perfect, but, with the help of the Spirit, we reject the ways of darkness and “try to discern what is pleasing to the Lord” (v10).