What this sign reveals, John tells us, is "his glory." Jesus, who is himself the manifestation of God's glory, reveals his own glory - who he is and what he is here to do - in this miracle. When the water turns to wine and the eye of faith peers into the purification vessels, it sees not sacred water but sacred wine. The eye of faith sees not an image of itself but the image of Jesus floating on the surface of the wine. Jesus is seen in this wine for who he really is: the one who not only provides but is himself the joy of the kingdom.from The Jesus Creed: Loving God, Loving Others, by Scot McKnight, p. 165
All human yearning is ultimately a yearning for an abundance of the sort of wedding wine that is Jesus himself. This is to say that our yearning is really to know the joy that comes from knowing the love of God (in Jesus). The Jesus Creed reveals that what humans ultimately yearn for is love for God and others. To know that love is to know the joy of the wedding wine Jesus alone provides.