"Pray for the peace of Jerusalem: they shall prosper that love thee. Peace be within thy walls, and prosperity within thy palaces. For my brethren and companions' sakes, I will now say, 'Peace be within thee.'" Substituting Hellas for Jerusalem, this is the prayer of a Greek of the age of Isocrates, of Cleanthes, and of Alexander. Rome by war ends war, and establishes the _Pax Romana_ within her dominions, Spain, Gaul, Africa, Asia, Syria, Egypt. Disregarding the dying counsels of Augustus, Rome remains at truceless war with the world outside those limits. St. Just's proud resignation, "For the revolutionist there is no rest but the grave," is for ever true of those races dowered with the high and tragic doom of empire. To pause is disaster; to recede, destruction. Rome understood this, and her history is its great comment. To Islam the point at which she can bestow her peace upon men is not less clear, fixed by a power not less unalterable and high. Neither Haroun nor Al-Maimoun could, with all their authority and statecraft, stay the steep course of Islam; for the wisdom of a race is wiser than the wisdom of a man, and the sword which, in Abu Bekr's phrase, the Lord has drawn, Islam sheathes but on the Day of Judgment. Then and then only shall the Holy War end. The Peace of Islam, _Shalom_, which is its designation, is the serenity of soul of the warriors of God whose life is a warfare unending. And Virgil--in that early masterpiece, which in the Middle Age won for all his works the felicity or the misfortune attached to the suspicion of an inspiration other than Castalian, and drew to his grave pilgrims fired by an enthusiasm whose fountain was neither the ballad-burthen music of the _Georgics_, nor the measureless pathos and pity for things human of the _Aeneid_--has sung the tranquil beauty of the Saturnian age; yet the peace which suggests his prophetic memory or hope is but the peace of Octavianus, the end of civil discord, of the proscriptions, the conflicts of Pharsalia, Philippi, Actium, a moment's respite to a war-fatigued world.