1. Jesus called Himself the vine, and His disciples the branches, and His Father the husbandman; whereon we have already discoursed as we were able. But in the present passage, while still speaking of Himself as the vine, and of His branches, or, in other words, of the disciples, He said, “Abide in me, and I in you.” They are not in Him in the same kind of way that He is in them. And yet both ways tend to their advantage, and not to His. For the relation of the branches to the vine is such that they contribute nothing to the vine, but from it derive their own means of life; while that of the vine to the branches is such that it supplies their vital nourishment, and receives nothing from them. And so their having Christ abiding in them, and abiding themselves in Christ, are in both respects advantageous, not to Christ, but to the disciples. For when the branch is cut off, another may spring up from the living root; but that which is cut off cannot live apart from the root.
Complete source paragraph · Tractates on the Gospel of John, Tractate 81, source paragraph 3 · Original source