2. The most famous and influential actor in this period of the French clearing up, is _Voltaire_ (1694-1778). Though a writer of great versatility, rather than a philosopher, there was yet no philosopher of that time who exerted so powerful an influence upon the whole thinking of his country and his age. Voltaire was no atheist. On the contrary, he regarded the belief in a Supreme Being to be so necessary, that he once said that if there were no God we should be under the necessity of inventing one. He was just as little disposed to deny the immortality of the soul, though he often expressed his doubts upon it. He regarded the atheistic materialism of a La Mettrie as nothing but nonsense. In these respects, therefore, he is far removed from the standpoint of the philosophers who followed him. His whole hatred was expended against Christianity as a positive religion. To destroy this system he considered as his peculiar mission, and he left no means untried to attain this anxiously longed-for end. His unwearied warfare against every positive religion prepared the way and gave weapons for the attacks against spiritualism which followed.
3. The Encyclopedists had a more decidedly sceptical relation to the principles and the basis of spiritualism. The philosophical Encyclopedia established by _Diderot_ (1713-1784), and published by him in connection with d’Alembert, is a memorable monument of the ruling spirit in France in the time before the revolution. It was the pride of France at that age, because it expressed in a splendid and universally accessible form the inner consciousness of the French people. With the keenest wit it reasoned away law from the state, and freedom from morality, and spirit and God from nature, though all this was done only in scattered, and, for the most part, timorous intimations. In Diderot’s independent writings we find talent of much philosophic importance united with great earnestness. But it is very difficult to fix and accurately to limit his philosophic views, since they were very gradually formed, and Diderot expressed them always with some reserve and accommodation. In general, however, it may be remarked, that in the progress of his speculations he constantly approached nearer the extreme of the philosophical direction of his age. In his earlier writings a Deist, he afterwards avowed the opinion that every thing is God. At first defending the immateriality and immortality of the soul, he expressed himself at a later period decidedly against these doctrines, affirming that the species alone has an abiding being while the individual passes away, and that immortality is nothing other than to live in the thoughts of coming generations. But Diderot did not venture to the real extreme of logical materialism; his moral earnestness restrained him from this.