Isaiah 5:4

“What could have been done more to my vineyard, that I have not done in it? &c.] Or “ought”, as the Vulgate Latin: this is generally understood of good things done to it in time past; as what better culture could it have had? what greater privileges, blessings, and advantages, natural, civil, and religious, could have been bestowed on this people? what greater favour could have been shown them, or honour done them? or what of this kind remains to be done for them? they have had everything that could be desired, expected, or enjoyed: though it may be rendered, “what is further or hereafter to be done to my vineyard”f93, and “I have not done in it?” that is, by way of punishment; I have…”

“God has done all that could be done for the salvation of sinners, consistently with His justice and goodness. The God of nature is, as it were, amazed at the unnatural fruit of so well-cared a vineyard.”

“What could I... - As a man who had done what is described in Isaiah 5:2, would have done all that “could” be done for a vineyard, so God says that he has done all that he could, in the circumstances of the Jews, to make them holy and happy. He had chosen them; had given them his law; had sent them prophets and teachers; had defended them; had come forth in judgment and mercy, and he now appeals “to them” to say what “could” have been done more. This important verse implies that God had done all that he could have done; that is, all that he could consistently do, or all that justice and goodness required him to do, to secure the welfare of his people. It cannot, of course, be meant that he…”

“Isa 1:5; Ch2 36:14-16; Jer 2:30, Jer 2:31, Jer 6:29, Jer 6:30; Eze 24:13; Mat 23:37; Act 7:51-60 Isaiah 5:5”