The Cartesian mechanical theory of the world and the doctrine of invariable law, carried to a logical conclusion, excluded the doctrine of Providence. This doctrine was already in serious danger. Perhaps no article of faith was more insistently attacked by sceptics in the seventeenth century, and none was more vital. The undermining of the theory of Providence is very intimately connected with our subject; for it was just the theory of an active Providence that the theory of Progress was to replace; and it was not till men felt independent of Providence that they could organise a theory of Progress. Bossuet was convinced that the question of Providence was the most serious and pressing among all the questions of the day that were at issue between orthodox and heretical thinkers. Brunetiere, his fervent admirer, has named him the theologian of Providence, and has shown that in all his writings this doctrine is a leading note. It is sounded in his early sermons in the fifties, and it is the theme of his most ambitious work, the Discourse on Universal History, which appeared in 1681. [Footnote; It has been shown that on one hand he controverts Spinoza's Tractatus theologico-politicus, and on the other the dangerous methods of Richard Simon, one of the precursors of modern biblical criticism. Brunetiere, op. cit. 74-85.] This book, which has received high praise from those who most heartily dissent from its conclusions, is in its main issue a restatement of the view of history which Augustine had worked out in his memorable book. The whole course of human experience has been guided by Providence for the sake of the Church; that is, for the sake of the Church to which Bossuet belonged. Regarded as a philosophy of history the Discourse may seem little more than the theory of the De Civitate Dei brought up to date; but this is its least important aspect. We shall fail to understand it unless we recognise that it was a pragmatical, opportune work, designed for the needs of the time, and with express references to current tendencies of thought.