24. Over all of these men, and even in some measure over Voltaire, Diderot (1713-1784) stands pre-eminent, on retrospect, for variety of power and depth and subtlety of thought; though for these very reasons, as well as because some of his most masterly works were never printed in his lifetime, he was less of a recognized popular force than some of his friends. In his own mental history he reproduces the course of the French thought of his time. Beginning as a deist, he assailed the contemporary materialists; in the end, with whatever of inconsistency, he was emphatically an atheist and a materialist. One of his most intimate friends was Damilaville, of whom Voltaire speaks as a vehement anti-theist; [1100] and his biographer Naigeon, who at times overstated his positions but always revered him, was the most zealous atheist of his day. [1101] Compare, as to Diderot's position, Soury's contention (p. 577) that we shall never make an atheist and a materialist out of "this enthusiastic artist, this poet-pantheist" (citing Rosenkranz in support), with his own admissions, pp. 589-90, and with Lord Morley's remarks, pp. 33, 401, 418. See also Lange, i, 310 sq.; ii, 63 (Eng. tr. ii, 32, 256). In the affectionate éloge of his friend Meister (1786) there is an express avowal that "it had been much to be desired for the reputation of Diderot, perhaps even for the honour of his age, that he had not been an atheist, or that he had been so with less zeal." The fact is thus put beyond reasonable doubt. In the Correspondance Littéraire of Grimm and Diderot, under date September 15, 1765 (vii, 366), there is a letter in criticism of Descartes, thoroughly atheistic in its reasoning, which is almost certainly by Diderot. And if the criticism of Voltaire's Dieu, above referred to (p. 231), be not by him, he was certainly in entire agreement with it, as with Grimm in general. Rosenkranz finally (ii, 421) sums up that "Diderot war als Atheist Pantheist," which is merely a way of saying that he was scientifically monistic in his atheism. Lange points out in this connection (i, 310) that the Hegelian schema of philosophic evolution, "with its sovereign contempt for chronology," has wrought much confusion as to the real developments of the seventeenth and eighteenth centuries.