The people of God must have a visible, tangible, experiential shape. This is not, however, simply a sociological or organizational necessity. It is essential to the mission Dei. The witness to God’s loving and saving work in history is through the people God calls and sets apart for this mission. Every mission community is a historical witness to the work of God being carried out; it is concrete evidence of God’s purposeful action. This is what the Holy Spirit does: it forms mission communities so that the gospel may be incarnated in particular places, to be the witness to Jesus Christ.