Some signs had already appeared of the form which his activity was now about to take. During his residence in Prussia he had completed his historical _Essai sur les Moeurs_, which passed over in rapid review the whole development of humanity, and closed with a brilliant sketch of the age of Louis XIV. This work was highly original in many ways. It was the first history which attempted to describe the march of civilization in its broadest aspects, which included a consideration of the great Eastern peoples, which dealt rather with the progress of the arts and the sciences than with the details of politics and wars. But its chief importance lay in the fact that it was in reality, under its historical trappings, a work of propaganda. It was a counterblast to Bossuet's _Histoire Universelle_. That book had shown the world's history as a part of the providential order--a grand unfolding of design. Voltaire's view was very different. To him, as to Montesquieu, natural causes alone were operative in history; but this was not all; in his eyes there was one influence which, from the earliest ages, had continually retarded the progress of humanity, and that influence was religious belief. Thus his book, though far more brilliant and far more modern than that of Bossuet, was nevertheless almost equally biased. It was history with a thesis, and the gibe of Montesquieu was justifiable. 'Voltaire,' he said, 'writes history to glorify his own convent, like any Benedictine monk.' Voltaire's 'convent' was the philosophical school in Paris; and his desire to glorify it was soon to appear in other directions.