Ideally, friendships lead us into deeper communion with each other; those we love mirror the divine reality and so draw us closer to the One they reflect. In our humanness, however, we can forget that the friend is only a reflection of God and instead invest ultimate meaning in the relationship.
Why is community a near-universal experience—especially for people of faith? One person put it this way: "Community is God's strategy for reaching the world." That's a neat way of saying that as community—rather than as individuals—we model what God has in mind for humanity.