"This Sunday's readings, taken from the prophet Isaiah and the Gospel, present us with one of the great images of sacred Scripture: the image of the vineyard.
"In sacred Scripture, bread represents everything man needs for his daily life. Water gives the earth fertility: It is the fundamental gift that makes life possible. Wine, on the contrary, expresses the exquisiteness of creation, it gives us the feast that goes beyond the limits of daily life: Wine "gladdens the heart."
"In this way, wine and with it the vine have also become the image of the gift of love, in which we can have a certain experience of the taste of the divine. And so the reading of the prophet, which we just heard, begins with a canticle of love: God created a vineyard, image of his history of love with humanity, of his love for Israel which he chose."
--Pope Benedict XVI, homily for the opening of the Synod on the Eucharist