As if He had said, I will not drink wine until the Resurrection; for He calls His Resurrection “the kingdom”, as He then reigned over death. But after His Resurrection He ate and drank with His disciples, shewing that it was He Himself who had suffered. But He drank it “new”, that is, in a new and strange manner, for He had not a body subject to suffering, and requiring food, but immortal and incorruptible.
We may also understand it in this way. The vine is the Lord Himself. By the offspring (genimen) of the vine is meant mysteries, and the secret understanding, which He Himself begets (gererat), Who teaches man knowledge. But in the kingdom of God, that is, in the world to come, He will drink with His disciples mysteries and knowledge, teaching us new things, and revealing what He now hides.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).