In Western Europe a broken arch and some fragments of stone are often all that mark the place where stood some perfect achievement of mediaeval architecture, a feudal stronghold or an abbey. But on the lower plains of the Euphrates and Tigris, a ruin hardly more conspicuous may denote the seat of an empire. Such a region, fronting the desert, formed a fit theatre for man's first speculations upon his own destiny and that of the nations. Those two inquiries have proceeded together. His vision of the universe, original or accepted, inevitably shapes and transforms the poet's, the prophet's, or the historian's vision of any portion of that universe, however limited in time and space. Hebrew literature, affected by the revolutions of Assyria, Chaldaea, Media, and Egypt, already discloses two theories which, modified or applied, mould man's thought when bent to this problem down to the present hour. Round one or other of these conceptions the speculations of over two thousand years naturally group themselves. The first of these theories, which may be styled the Theory of Retribution, attributes the decay of empires to the visitation of a divine vengeance. The fall of an empire is the punishment of sin and of wrong-doing. The pride and iniquity of the few, or the corruption and ethical degeneration of the mass, involves the ruin of the State. Regardless of the contradictions to this law in the life of the individual, its supremacy in the life of empires has throughout man's history been decreed and proclaimed. Hebrew thought was perplexed and amazed from the remotest periods at the felicity of the oppressor and the unjust man, and the misery of the good. But the sublime and inspired rhetoric of Isaiah rests upon the assumption that the punishment of wrong, uncertain amongst men, is sure amongst nations and States. In a more ethical form this conception is easily traced throughout Greek and Roman thought. In St. Augustine it reappears in its original shape, and invested with the dignity, the fulness, and the precision of an historical argument. A Roman by birth, culture, and youthful sympathies, loving the sad cadences of Virgil like a passion, admitted by Cicero to an intimacy with Hellenic thought, he is, later in life, attracted, fascinated, and finally subdued by the ideal of the Nazarene, and by the poetry and history behind it. He sees Rome fall; and what the fate of Babylon was to the Hebrew prophet the fate of Rome becomes to Augustinus--the symbol of divine wrath, the punishment of her pride, her idolatry, and her sin. Rome falls as Babylon, as Assyria fell; but in the _De Civitate_, to which he devotes some fifteen years of his life, is delineated the city which shall not pass away.[3] The destruction of Rome, limited in time and space, coalesces with the wider thought of the Stoics, the destruction of the world.