Isaiah 5:4

What could I... -As a man who had done what is described inIsaiah 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.