A small-group ministry can be the primary means by which your congregation expresses its life and mission. No matter what activities are prominent in the group (sharing, study, prayer, celebration, mission and so forth), it is the quality of Christian "life together" -- Christian community -- that brings Life for ourselves and draws people outside to ask: "What is going on here? This life is attractive and I'd like to experience it too!" It is at this point that the verbalization of the gospel makes sense -- as an explanation for the quality of life among us as Christians, the "koinonia", Christian community.
-- Thomas G. Kirkpatrick in Small Groups in the Church: A Handbook for Creating Community (Alban Institute)