In chapter 3 Paul tells Christian what they are to put off. “Members of the Earth” refers to all of our worldly passions and appetites, in particular sexual sin, idolatry, greed and malice. Paul tells us to decisively put to death what is Earthbound in us.
The practical exhortations of this chapter of Paul’s letter contains many guidelines for the Christian life. We are enjoined to live in peace with one another, approaching our interactions with fellow Christians with a sense of empathy and kindness.