Isaiah did not shirk it. He said boldly to his people, and to the nations: "The faith we have covers this vaster life. Jehovah is not only God of Israel. He rules the world." These prophecies to the foreign nations are full of revelations of the sovereignty and providence of God. The Assyrian may seem to be growing in glory; but Jehovah is watching from the heavens, till he be ripe for cutting down (xviii. 4). Egypt's statesmen may be perverse and wilful; but Jehovah of hosts swingeth His hand against the land: _they shall tremble and shudder_ (xix. 16). Egypt shall obey His purposes (17). Confusion may reign for a time, but a signal and a centre shall be lifted up, and the world gather itself in order round the revealed will of God. The audacity of such a claim for his God becomes more striking when we remember that Isaiah's faith was not the faith of a majestic or a conquering people. When he made his claim, Judah was still tributary to Assyria, a petty highland principality, that could not hope to stand by material means against the forces which had thrown down her more powerful neighbours. It was no experience of success, no mere instinct of being on the side of fate, which led Isaiah so resolutely to pronounce that not only should his people be secure, but that his God would vindicate His purposes upon empires like Egypt and Assyria. It was simply his sense that Jehovah was exalted in righteousness. Therefore, while inside Judah only the remnant that took the side of righteousness would be saved, outside Judah wherever there was unrighteousness, it would be rebuked, and wherever righteousness, it would be vindicated. This is the supremacy which Isaiah proclaimed for Jehovah over the whole world.
How spiritual this faith of Isaiah was, is seen from the next step the prophet took. Looking out on the troubled world, he did not merely assert that his God ruled it, but he emphatically said, what was a far more difficult thing to say, that it would all be consciously and willingly God's. God rules this, not to restrain it only, but to make it His own. The knowledge of Him, which is to-day our privilege, shall be to-morrow the blessing of the whole world.
When we point to the Jewish desire, so often expressed in the Old Testament, of making the whole world subject to Jehovah, we are told that it is simply a proof of religious ambition and jealousy. We are told that this wish to convert the world no more stamps the Jewish religion as being a universal, and therefore presumably a Divine, religion than the Mohammedans' zeal to force their tenets on men at the point of the sword is a proof of the truth of Islam.