Hilary of Poitiers

The doctrines of the gospel were well known to holy and blessed David in his capacity of prophet, and although it was under the law that he lived his bodily life, he yet filled, as far as in him lay, the requirements of the apostolic concern and justified the witness borne to him by God in the words: I have found a man after my own heart, David, the son of Jesse. He did not avenge himself upon his foes by war, he did not oppose force of arms to those that laid wait for him, but after the pattern of the Lord, whose name and whose meekness alike he foreshadowed, when he was betrayed he entreated, when he was in danger he sang psalms, when he incurred hatred he rejoiced; and for this cause he was found a man after God’s own heart.