...their labor is in vain who build it.
Jesus is the only "instrument" of communion, since it is through baptism into his death that we enter the only communion that endures. All other "communions" are merely means to an end -- Jesus Christ is both the instrumental means and the desired end.
To place anything but God in the place of God is idolatry. We are called to be One even as the Son and the Father are One in the Spirit. We are invited into this mystical union as members of Christ's Body — the one Church of which all the baptized are members, in spite of their protests to the contrary. Like it, or, as is sometimes the case, not, we are in this together. The more we act that way, the better it will be for us.
A thought on Trinity Sunday — Tobias Haller BSG