But none of these tendencies in Israel went so far as to deny that there was a God, or even to doubt His existence. This, as we have said, was nowhere yet the temptation of mankind. When the Jew lapsed from that true faith, which we have seen his nation carry into exile, he fell into one of the two tempers just described--devotion to false gods in the shape of idols, or despondency consequent upon false notions of the true God. It is against these tempers, one after another, that ch. xl. 12-31 is directed. And so we understand why, though the prophet is here declaring the basis and spring of all his subsequent prophecy, he does not adopt the method of abstract argument. He is not treating with men, who have had no true knowledge of God in the past, or whose intellect questions God's reality. He is treating with men, who have a national heritage of truth about God, but they have forgotten it; who have hearts full of religious affection, but it has been betrayed; who have a devout imagination, but it has been starved; who have hopes, but they are faint unto death. He will recall to them their heritage, rally their shrinking convictions by the courage of his own faith, feed their hunger after righteousness[43] by a new hope set to noble music, and display to the imagination that has been stunted by so long looking upon the face of idols the wide horizons of Divine glory in earth and heaven. His style corresponds to his purpose. He does not syllogize; he exhorts, recalls and convicts by assertion. The passage is a series of questions, rallies and promises. _Have ye not known? have ye not heard?_ is his chief note. Instead of arranging facts in history or nature as in themselves a proof for God, he mentions them only by way of provoking inward recollections. His sharp questions are as hooks to draw from his hearers' hearts their timid and starved convictions, that he may nourish these upon the sacramental glories of nature and of history.