A faithful Mohammedan student, after having struggled through a handbook of law, may be vexed by a doubt as to whether these endless casuistic precepts have been rightly deduced from the Qorân and the Sacred Tradition. His doubt, however, will at once be silenced, if he bears in mind that Allah speaks more plainly to him by this infallible Agreement (_Ijmâ'_) of the Community than through Qorân and Tradition; nay, that the contents of both those sacred sources, without this perfect intermediary, would be to a great extent unintelligible to him. Even the differences between the schools of law may be based on this theory of the Ijmâ'; for, does not the infallible Agreement of the Community teach us that a certain diversity of opinion is a merciful gift of God? It was through the Agreement that dogmatic speculations as well as minute discussions about points of law became legitimate. The stamp of Ijmâ' was essential to every rule of faith and life, to all manners and customs. All sorts of religious ideas and practices, which could not possibly be deduced from Mohammed's message, entered the Moslim world by the permission of Ijmâ'. Here we need think only of mysticism and of the cult of saints. Some passages of the Qorân may perhaps be interpreted in such a way that we hear the subtler strings of religious emotion vibrating in them. The chief impression that Mohammed's Allah makes before the Hijrah is that of awful majesty, at which men tremble from afar; they fear His punishment, dare hardly be sure of His reward, and hope much from His mercy. This impression is a lasting one; but, after the Hijrah, Allah is also heard quietly reasoning with His obedient servants, giving them advice and commands, which they have to follow in order to frustrate all resistance to His authority and to deserve His satisfaction. He is always the Lord, the King of the world, who speaks to His humble servants. But the lamp which Allah had caused Mohammed to hold up to guide mankind with its light, was raised higher and higher after the Prophet's death, in order to shed its light over an ever increasing part of humanity. This was not possible, however, without its reservoir being replenished with all the different kinds of oil that had from time immemorial given light to those different nations. The oil of mysticism came from Christian circles, and its Neo-Platonic origin was quite unmistakable; Persia and India also contributed to it. There were those who, by asceticism, by different methods of mortifying the flesh, liberated the spirit that it might rise and become united with the origin of all being; to such an extent, that with some the profession of faith was reduced to the blasphemous exclamation: "I am Allah." Others tried to become free from the sphere of the material and the temporal by certain methods of thought, combined or not combined with asceticism. Here the necessity of guidance was felt, and congregations came into existence,