4. We have, once more, the wonderful _harmony between the different parts of the Bible_, written as it was in different and distant ages, and by men who differed widely from each other in natural character and education, and lived in very different states of society. In outward form and institutions the manifestation of God has indeed undergone great changes; for it has existed successively under the patriarchal, the Mosaic, and the Christian dispensations. But if we look beneath the surface to the substance of religion in these different dispensations, we shall find it always the same. The God of Abraham, Isaac, and Jacob, the God of Moses, Samuel, and David, is also the God of our Lord Jesus Christ. While he changes from time to time the outward ordinances of his people, he remains himself "the same yesterday and to-day and for ever." Under the Old Testament, not less than under the New, he is "the Lord, the Lord God, merciful and gracious, long-suffering and abundant in goodness and truth, keeping mercy for thousands, forgiving iniquity, transgression, and sin, and that will by no means clear the guilty." Exod. 34:6, 7, etc. Under the New Testament, not less than under the Old, he is to all the despisers of his grace "a consuming fire," Heb. 12:29; and his Son Jesus Christ, whom he sent to save the world, will be revealed hereafter "in flaming fire, taking vengeance on them that know not God, and that obey not the gospel of our Lord Jesus Christ." 1 Thess. 1:7, 8. If the New Testament insists on the obedience of the heart, and not of the outward letter alone, the Old Testament teaches the same doctrine: "Behold, to obey is better than sacrifice, and to hearken than the fat of rams." 1 Sam. 15:22. "Thou desirest not sacrifice; else would I give it: thou delightest not in burnt offering. The sacrifices of God are a broken spirit; a broken and a contrite heart, O God, thou wilt not despise." Psa. 51:16, 17. "I will praise the name of God with a song, and will magnify him with thanksgiving. This also shall please the Lord better than an ox or bullock that hath horns and hoofs." Psa. 69:30, 31. "Take thou away from me the noise of thy songs; for I will not hear the melody of thy viols. But let judgment run down as waters, and righteousness as a mighty stream." Amos 5:23, 24. If the Old Testament insists on obedience to all God's commandments as an indispensable condition of salvation, so does the New: "Whosoever shall keep the whole law, and offend in one point, he is guilty of all," James 2:10; "If thy right eye offend thee, pluck it out, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell." Matt. 5:29, etc. The Old Testament, as well as the New, teaches the doctrine of regeneration and sanctification by the Holy Ghost: "Create in me a clean heart, O God, and renew a right spirit within me," Psa. 51:10.