2. He must assure them that the faithful discharge of their duty would advance and secure their prosperity, v. 4. There shall then be a succession of kings, an uninterrupted succession, upon the throne of David and of his line, these enjoying a perfect tranquillity, and living in great state and dignity, riding in chariots and on horses, as before, ch. xvii. 25. Note, the most effectual way to preserve the dignity of the government is to do the duty of it.