" The filling of the jars to the brim indicates that the appointed time for the ceremonial observances of the Jewish law had run its full course; these observances had so completely fulfilled their purpose that nothing of the old order remained to be accomplished. The time had come therefore for the new order to be inaugurated. The wine symbolizes the new order as the water in the jars symbolized the old order. The “chief steward "

― F.F. Bruce , The Gospel of John: A Verse-by-Verse Exposition