Let me try and spin all this talk of community in a slightly different direction. Here is an extract from some lecture notes I use when teaching on the Trinity at our Newfrontiers leadership training:
Union with God is the goal of our salvation.
We were made in the image of God. Christ, the second Adam has made it possible for us to again attain that image. We tend to focus on the past aspects of salvation – regeneration, justification – and on the current implications – how we live – but neglect the goal of salvation – resurrection and union with God. These other things apply here and now, but glorification (or deification) lasts for eternity.
Theologically, we see a number of unions:
The incarnate Word – God and man
The union of Christ with his church
The reuniting of Christ and his church in the Eucharist
Our union with Christ is indivisible, since Christ is indivisibly united to the Father.
This is why union is so important to God. It is why covenants are unbreakable. It is why God hates divorce.
2 Peter 1:3-4 "His divine power has given us everything we need for life and godliness through our knowledge of him who called us by his own glory and goodness. Through these he has given us his very great and precious promises, so that through them you may participate in the divine nature"
1 John 3:1-2 "How great is the love the Father has lavished on us, that we should be called children of God! And that is what we are! The reason the world does not know us is that it did not know him. Dear friends, now we are children of God, and what we will be has not yet been made known. But we know that when he appears, we shall be like him, for we shall see him as he is."
The definition of human personhood is that a human is one who can in principle be in communion with God.
In the incarnation the Son united with a single human nature, at Pentecost the Spirit indwelled countless human persons.
The Spirit establishes our humanity. He makes us what we are meant to be.
Calvin: “the purpose of the gospel is to make us sooner or later like God.”
The Lord’s Supper anticipates the great eschatological feast, the marriage supper of the Lamb.
How do we know we are Christians? By being like God.
What does that mean? Love!
Love is the acid test of Christianity. If we lack love, we are not his. “Attributes like grace, mercy, justice, and even holiness are all relative to creatures. His wrath is relative to sinners, as the expression of his holiness in response to human sin. Love, however, belongs to who he is in himself in the undivided communion of the three persons.” (Letham, “The Holy Trinity”)