According to John’s Gospel, the first miracle Jesus performs in his public ministry is to turn water into wine at a wedding. John’s Gospel calls the miracles “signs” because through them we see the glory of God. This sign meant seeing God’s glory at a feast – a wedding banquet.
A covenant between parties is a two-way street. We aren’t mere recipients of Jesus’ salvific act. We aren’t coming to the table just to “remember,” and proclaim a big hearty “thank you.” We are called to obedience, to be faithful to the covenant in which we have been inaugurated. We are eating and drinking the atonement. We are being baptized into it. We are committing ourselves to the baptismal life, the-dying-and-rising-to-Christ life.