We are called to 'grow up' into the likeness of Jesus. That will work out differently in each of our lives. We need the Holy Spirit to enable us to develop and use his gifts and keep us together, living in unity and love to strengthen the church and reach out with God's love to the world around us.
Paul reminds the the gentiles that Jesus, through his death and resurrection, has broken the walls of enmity and division between God and between his people. We are all, because of this, one family of God, a new creation, a new humanity.