About this time Judea was constantly exposed to the rapacity of the great Assyrian power before whose armies she finally fell; sometimes her rulers entered into coalitions with the surrounding nations to resist the Assyrian; sometimes they submitted and paid heavy tribute. Egypt, on the south, was also a mighty empire at this time, constantly at war with Assyria; and the kings of Judah sometimes sought alliances with one of these great powers, as a means of protection against the other. They proved to be the upper and nether millstones between which the Jewish nationality was ground to powder. It was in the midst of these alarming signs of national destruction that Isaiah arose. Of the prophetic discourses which he delivered in Jerusalem we have about thirty; his words are the words of a patriot, a statesman, a servant and messenger of Jehovah. He warned the kings against these entangling alliances with foreign powers; he admonished them to stand fast in their allegiance to Jehovah, and obey his laws; yet he saw that they would not heed his word, and that swift and sure destruction was coming upon the nation. And his expectation was not like that of the other prophets, that the nation as a whole would be saved out of these judgments; to him it was made plain that only a remnant would survive; but that from that remnant should spring a noble race, with a purer faith, in whom all the nations of the earth should be blessed. Of the Messianic hope as it finds expression in these words of Isaiah I have already spoken. This Book of Isaiah contains thirty-one prophetic discourses, some of them mere fragments. There is reason for doubt as to whether they were all spoken by Isaiah; when they were gathered up, two hundred years later, some utterances of other prophets may have been mingled with them. Indeed it is now regarded as well-nigh certain that the last twenty-seven chapters are the work of a later prophet,--of one who wrote during the Captivity. Professor Delitzsch, in the last edition of his commentary on Isaiah, finally concedes that this is probable. The Book of Isaiah, he is reported as saying, "may have been an anthology of prophetic discourses by different authors; that is, it may have been composed partly and directly by Isaiah, and partly by other later prophets whose utterances constitute a really homogeneous and simultaneous continuation of Isaian prophecy. These later prophets so closely resemble Isaiah in prophetic vision that posterity might, on that account, well identify them with him,--his name being the correct common denominator for this collection of prophecies."