And the vineyard which your right hand has planted, and the branch that you made strong for yourself.
Read Chapter 80
Augustine of Hippo
9. But with what profit is this? "O God of virtues turn Thou nevertheless" (ver. 14). Although these things have been done, "Turn Thou nevertheless." "Look from heaven and see, and visit this vineyard." "And perfect Thou her whom Thy right hand hath planted" (ver. 15). No other plant Thou, but this make Thou perfect. For she is the very seed of Abraham, she is the very seed in whom all nations shall be blessed: there is the root where is borne the graffed wild olive. "Perfect Thou this vineyard which Thy right hand hath planted." But wherein doth He perfect? "And upon the Son of man, whom Thou hast strengthened to Thyself." What can be more evident? Why do ye still expect, that we should still explain to you in discourse, and should we not rather cry out with you in admiration, "Perfect Thou this vineyard which Thy right hand hath planted, and upon the Son of man" perfect her? What Son of man? Him "whom Thou hast strengthened to Thyself." A mighty stronghold: build as much as thou art ...
And look down upon "the Messias "(Chaldean) the true vine, John xv. 1., and Matthew xxi. 33. (Calmet)
Of man, is not in Hebrew, only, ver. 18. (Haydock)
Some perfection was wanting in the Church of the Old Testament.