The moral conception of God had its roots far down in the religion of Israel, as may be seen in the older (certainly preprophetic) strata in Samuel, and better still in the patriarchal legends, which received their present form in the same age; but after the establishment of the kingdom it was crossed by the national idea. It was not till the eighth century that the men came who thought through what the moral idea of God involves, and had the courage to proclaim its consequences, fatal though they might be to both state and church. These prophets, beginning with Amos, not only preached a new doctrine, they employed a new method. The message which they spoke to the heedless, incredulous, or hostile ears of their contemporaries, they also recorded, whether in the hope to reach through the written page a larger audience, or to perpetuate their words to generations following. Thus there begins a prophetic literature which is one of the most characteristic features of the Old Testament. Four prophets of the second half of the eighth century have given their names to such prophetic books, Amos, Hosea, Isaiah, and Micah. Then, in the latter part of the seventh century and the beginning of the sixth, follow the little books of Zephaniah, Nahum, and Habbakuk, and the great one of Jeremiah, whose younger contemporary in Babylonia is Ezekiel. Haggai and Zechariah were instrumental in the rebuilding of the temple in the reign of Darius I. In the discussion of these books we shall not attempt a chronological disposition, but follow the order of the English Bible. CHAPTER XVI ISAIAH The first of the prophetic books bears the name of Isaiah, a Judæan prophet, who dates his call "in the year that king Uzziah died," a year which cannot be fixed with certainty, but was at all events not very long before 734 B.C., and whose latest dated utterances are from the time of Sennacherib's invasion in the year 701. His prophecies thus range over a period of not far from forty years. He witnessed the humbling of Israel by Tiglath-Pileser in 734, the fall of Samaria in 721, the Assyrian campaigns in the west in 720 and 711, and the condign punishment Sennacherib inflicted on Judah in 701; and all these events (of which we have historical knowledge from both Assyrian and Jewish sources) are reflected in his prophecies.