Israel was saved from the same spiritual disease by the great words which succeed the assertion of Yahweh's oneness. The writer of Deuteronomy did not desire to set forth this declaration as an abstract statement of ultimate truth about God. He makes it the basis of a quite new, a quite original demand upon his countrymen. Because Yahweh thy God is one Yahweh, "thou shalt love Yahweh thy God with all thine heart, and with all thy soul, and with all thy might." To us, who have inherited all that was attained by Israel in their long and eventful history as a nation, and especially in its disastrous close, it may have become a commonplace that God demands the love of His people. But if so, we must make an effort to shake off the dull yoke of custom and familiarity. If we do, we shall see that it was an extraordinarily original thing which the Deuteronomist here declares. In the whole of the Old Testament there are, outside of Deuteronomy, thirteen passages in which the _love_ of men to Yahweh is spoken of. They are Exod. xx. 6; Josh. xxii. 5, xxiii. 11; Judges v. 31; 1 Kings iii. 3; Neh. i. 5; Psalms xviii. 2, xxxi. 24, xci. 14, xcvii. 10, cxvi. 1, cxlv. 20; and Dan. ix. 4. Now of these the verses from Nehemiah and Daniel are manifestly later than Deuteronomy, and of the Psalms only the eighteenth can with any confidence be assigned to a time earlier than the seventh century B.C. All the others may with great probability be assigned at earliest to the times of Jeremiah and the post-exilic period. Three of the passages from the historic books again--Josh. xxii. 5, xxiii. 11; 1 Kings iii. 3--are attributed, on grounds largely apart from the use of this expression, to the Deuteronomic editor, _i.e._ the writer who went over the historical books about 600 B.C., and made slight additions here and there, easily recognisable by their differing in tone and feeling from the surrounding context. Indeed Josh. xxii. 5 is a palpable quotation from Deuteronomy itself.
Of the thirteen passages, therefore, only three--Exod. xx. 6, Judges v. 31, and Psalm xviii. 2--belong to the time previous to Deuteronomy, and in all three the mention of love to God is only allusive, and, as it were, by the way. Before Deuteronomy, consequently, there is little more than the mere occurrence of the word. There is nothing of the bold and decisive demand for love to the one God as the root and ground of all true relations with Him which Deuteronomy makes. At most, there is the hint of a possibility which might be realised in the future; of love to God as the permanent element in the life of man there is no indication; and it is this which the author of Deuteronomy means, and nothing less than this. He makes this demand for love the main element of his teaching. He returns to it again and again, so that there are almost as many passages bearing on this in Deuteronomy as in the whole Old Testament besides; and the particularity and emphasis with which he dwells upon it are immeasurably greater. Only in the New Testament do we find anything quite parallel to what he gives us; and there we find his view taken up and expanded, till love to God flashes upon us from almost every page as the test of all sincerity and the guarantee of all success in the Christian life.
To proclaim this truth was indeed a great achievement; and when we remember the abject fear with which Israel had originally regarded Yahweh, it will appear still more remarkable that the book embodying this should have been adopted by the whole people with enthusiasm, and that with it should begin the Canon of Holy Scripture; for Deuteronomy, as all now recognise, was the first book which became canonical. I have said that the conception was an extraordinarily original one, and have pointed out that it had not been traceable to any extent previously in Israel's religious books or its religious men. It will appear still more original, I think, if we consider what a growth in moral and spiritual stature separates the Israel of Moses' day and that of Josiah's; what the attitude of other nations to their gods was in contrast to this; and, lastly, what it involves and implies, as regards the nature of both God and man.