_Specific Causes of the Crusades_.--If we examine more specifically into the real causes of the crusades we shall find, as Mr. Guizot has said, that there were two causes, the one moral, the other social. The moral cause is represented in the {322} desire to relieve suffering humanity and fight against the injustice of the Turks. Both the Mohammedan and the Christian, the two most modern of all great religions, were placed upon a moral basis. Morality was one of the chief phases of both religions; yet they had different conceptions of morality, and no toleration for each other. Although prior to the Turkish invasion the Mohammedans, through policy, had tolerated the visitations of the Christians, the two classes of believers had never gained much respect for each other, and after the Turkish invasion the enmity between them became intense. It was the struggle of these two systems of moral order that was the great occasion and one of the causes of the crusades. The social cause, however, was that already referred to--the desire of individuals for a change from the monotony which had settled down over Europe under the feudal regime. It was the mind of man, the enthusiasm of the individual, over-leaping the narrow bounds of his surroundings, and looking for fields of exploitation and new opportunities for action. The social cause represents, then, the spontaneous outburst of long-pent-up desires, a return to the freedom of earlier years, when wandering and plundering were among the chief occupations of the Teutonic tribes. To state the causes more specifically, perhaps it may be said that the ambition of temporal and spiritual princes and the feudal aristocracy for power, the general poverty of the community on account of overpopulation leading the multitudes to seek relief through change, and a distinct passion for pilgrimages were influential in precipitating this movement. _Unification of Ideals and the Breaking of Feudalism_.--It is to be observed that the herald of the crusades thrilled all Europe, and that, on the basis of ideals of empire and church, there were a common sentiment or feeling and a common ground for action. All Europe soon placed itself on a common plane in the interest of a common cause. At first it would seem that this universal movement would have tended to {323} develop a unity of Western nations. To the extent of breaking down formal custom, destroying the sterner aspects of feudalism, and levelling the barriers of classes, it was a unifier of European thought and life.