Then this impression of the power and presence of God in their destinies was deepened in the Jews by the manifest Divine authority with which the prophets spake. They prophesied "in the name of the God of Israel"--the one God of the people of both kingdoms now united in their representatives. Their "Thus saith the Lord" was the powder that drove the shot of their message through the toughest hide of apathy. Except to a Platonist, ideas are impossible apart from the mind that thinks them. Now the Jews, as well as their prophets, felt that the great ideas of prophecy could not be the products of pure human thinking. The sublime character, the moral force, the superb hopefulness of these ideas proclaimed their Divine origin. As it is the mission of the prophet to speak for God, so it is the voice of God in His inspired messenger that awakes the dead and gives strength to the weak.
This ultimate source of prophecy accounts for its unique character of hopefulness, and that in turn makes it a powerful encouragement for the weak and depressed people to whom it is sent. Wordsworth tells us that we live by "admiration, love, and hope." If one of these three sources of vitality is lost, life itself shrinks and fades. The man whose hope has fled has no lustre in his eye, no accent in his voice, no elasticity in his tread; by his dull and listless attitude he declares that the life has gone out of him. But the ultimate end of prophecy is to lead up to a gospel, and the meaning of the word "gospel" is just that there is a message from God bringing hope to the despairing. By inspiring a new hope this message kindles a new life.