The master of the banquet repeated a common saying. Normally, the best wine was served first, when people could taste it most clearly. Later, wine of lower quality was served.
But this time it was different. The wine Jesus made, served last, was the best of all.
In the Old Testament, good wine was a sign of God’s blessing(Amos 9:13–14). This miracle showed that the Messiah, God’s greatest blessing, had now come.