Yet another glimpse is given us in these chapters of God's manner of dealing with men. We have seen how He guides and rules His chosen ones. We have seen how He punishes those who have set themselves against the Divine law. And in chapter ii. 30 we are told how men become hardened in their sin, so as to render destruction inevitable. Of Sihon, king of Heshbon, who would not let the Israelites pass by him, the writer says: "Yahweh thy God hardened his spirit, and made his heart obstinate, that He might deliver him into thy hand, as appeareth this day." But he does not mean by these expressions to lay upon God the causation of Sihon's obstinacy, so as to make the man a mere helpless victim. His thought rather is, that as God rules all, so to Him must be ultimately traced all that happens in the world. In some sense all acts, whether good or bad, all agencies, whether beneficent or destructive, have their source in and their power from Him. But nevertheless men have moral responsibility for their acts, and are fully and justly conscious of ill desert. Consequently that hardening of spirit or of heart, which at one moment may be attributed solely to God, may at another be ascribed solely to the evil determination of man. The most instructive instance of this is to be found in the history of Pharaoh, when he was commanded to let Israel go. In that narrative, from Exodus iv. to xi., there is repeated interchange of expression. Now it is Yahweh hardened Pharaoh's heart; now, as in viii. 15 and 32, Pharaoh hardened his own heart; and, again, Pharaoh's heart was hardened. In each case the same thing is meant, and the varying expressions correspond only to a difference of standpoint. When Yahweh foretells that the signs He authorises Moses to show will fail of their effect, it is always "Yahweh will harden Pharaoh's heart," since the main point in contemplation is His government of the world. If, on the other hand, it is the sinful obstinacy of Pharaoh which is prominent in the passage, we have the self-determination of Pharaoh alone set before us. But it is to be noted, and this is indeed the cardinal fact, that Yahweh never is said to harden the heart of a good man, or a man set mainly upon righteousness. It is always those who are guilty of palpable wrongs and acts of evil-doing upon whom God thus works.