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 ideas in the revolt against the Church had a place in Diderot's great work, the Encyclopædia, in which a number of leading thinkers collaborated with him. It was not merely a scientific book of reference. It was representative of the whole movement of the enemies of faith. It was intended to lead men from Christianity with its original sin to a new conception of the world as a place which can be made agreeable and in which the actual evils are due not to radical faults of human nature but to perverse institutions and perverse education. To divert interest from the dogmas of religion to the improvement of society, to persuade the world that man's felicity depends not on Revelation but on social transformation—this was what Diderot and Rousseau in their different ways did so much to effect. And their work influenced those who did not abandon orthodoxy; it affected the spirit of the Church itself. Contrast the Catholic Church in France in the eighteenth and in the nineteenth century. Without the work of Voltaire, Rousseau, Diderot, and their fellow-combatants, would it have been reformed? "The Christian Churches" (I quote Lord Morley) "are assimilating as rapidly as their formulæ will permit, the new light and the more generous moral ideas and the higher spirituality of