What could have been done more... — The prophet cuts off from the people the excuse that they had been unfairly treated, that their Lord was as a hard master, reaping where he had not sown (Matthew 25:24). They had had all the external advantages that were necessary for their growth in holiness, yet they had not used them rightly. (Comp. the striking parallelism of Hebrews 6:4-8.)
Related Commentaries of Isaiah 5:4
Isaiah 5:4
4 What could have been done more to my vineyard, that I have not done in it? wherefore, when I looked that it should bring forth grapes, brought it forth wild grapes?