The History of the Decline and Fall of the Roman Empire - Edward Gibbon [1946]
[Footnote 20: If the reader will turn to the first scene of the First Part of Henry the Fourth, he will see in the text of Shakespeare the natural feelings of enthusiasm; and in the notes of Dr. Johnson the workings of a bigoted, though vigorous mind, greedy of every pretence to hate and persecute those who dissent from his creed.]
[Footnote *: The manner in which the war was conducted surely has little relation to the abstract question of the justice or injustice of the war. The most just and necessary war may be conducted with the most prodigal waste of human life, and the wildest fanaticism; the most unjust with the coolest moderation and consummate generalship. The question is, whether the liberties and religion of Europe were in danger from the aggressions of Mahometanism? If so, it is difficult to limit the right, though it may be proper to question the wisdom, of overwhelming the enemy with the armed population of a whole continent, and repelling, if possible, the invading conqueror into his native deserts. The crusades are monuments of human folly! but to which of the more regular wars civilized. Europe, waged for personal ambition or national jealousy, will our calmer reason appeal as monuments either of human justice or human wisdom? - M.]
II. Palestine could add nothing to the strength or safety of the Latins; and fanaticism alone could pretend to justify the conquest of that distant and narrow province. The Christians affirmed that their inalienable title to the promised land had been sealed by the blood of their divine Savior; it was their right and duty to rescue their inheritance from the unjust possessors, who profaned his sepulchre, and oppressed the pilgrimage of his disciples. Vainly would it be alleged that the preeminence of Jerusalem, and the sanctity of Palestine, have been abolished with the Mosaic law; that the God of the Christians is not a local deity, and that the recovery of Bethlem or Calvary, his cradle or his tomb, will not atone for the violation of the moral precepts of the gospel. Such arguments glance aside from the leaden shield of superstition; and the religious mind will not easily relinquish its hold on the sacred ground of mystery and miracle.
III. But the holy wars which have been waged in every climate of the globe, from Egypt to Livonia, and from Peru to Hindostan, require the support of some more general and flexible tenet. It has been often supposed, and sometimes affirmed, that a difference of religion is a worthy cause of hostility; that obstinate unbelievers may be slain or subdued by the champions of the cross; and that grace is the sole fountain of dominion as well as of mercy. ^* Above four hundred years before the first crusade, the eastern and western provinces of the Roman empire had been acquired about