Nausicaa Elena Milani

L’usage de la raison et de la foy ou l’accord de la foy et de la raison (1704) by Pierre-Sylvain Régis can be considered his last attempt to defend the ‘new philosophy’ of René Descartes by vindicating its agreement with faith and protecting it from censorship. This contribution offers an analysis of the theories expounded by Régis in this treatise, showing how these evolved from those of his earlier Système de philosophie (1690), and arguing that both are characterized by a reinterpretation of the Cartesian metaphysics on an empirical basis. In particular, Régis offered an empirical interpretation of the relations between substances, attributes and modes, by which he criticized Spinoza’s metaphysics and attempted to solve the riddle of Descartes’ dualism.

One of the most mature achievements of the Cartesian philosophy is the aim to diffuse Descartes’ thought among a wider audience by presenting his philosophy in an encyclopedic way. A relevant contribution in this field is Pierre Sylvain Régis’s Système. Régis’s contribution consists both in reconciling the new scientific discoveries with les principes de Monsieur Descartes by combining them into a scholarly manual whose aim is to stimulate the ars inveniendi and in recognizing the relevance of Arnauld’s and Nicole’s L’art de penser as manual of Cartesian logic. In an article published on the «Annali della Scuola Normale Superiore di Pisa», pp. 517-55: L’«Art de penser» nella logica del «Système» di Régis) I analysed Régis’s logic in order to point out that, even if L’art de penser represents its only source, La logique of the Système has not to be considered as a mere compendium of the Port-Royal Logique, but as a revision of the latter according to a specific philosophical system, characterized by the empirical interpretation of Descartes’s philosophy. In this paper I provide a synopsis of the comparison between the logic of the Système and the Logique of Port-Royal, in order to resume in a schematic way the results of my research.

This work takes into account three Cartesian manuals diffused in 17th century France ; Jacques Rohault, Traité de physique ; Pierre-Sylvain Régis, Cours entier de philosophie, ou système general selon les principes de M. Descartes contenant la logique, la metaphysique, la physique et la morale ) in order to question if the development of an empirical attitude in the scientific research influenced their approaches to the study of motion. The article intends to deepen the role that these authors give to God in the physical structure of the universe with the purpose of investigating whether their analysis of motion is untainted by the metaphysical component or on what terms it remains linked to it.

The Système de philosophie by Pierre Sylvain Régis can be considered as the achievement both of the scientific liveliness of the Académie des Sciences in the 17th century and of its fruitful relationship with the Royal Society. Since it aims to shape the new conception of the universe in terms of a system, the Système represents one of the most mature achievements of Cartesian philosophy and it is characterized by an empirical interpretation of Descartes’ thought. The Système therefore reflects two important phenomena occurring in the Europe of the 17th century: the scientific revolution and the proliferation of Academies. In fact, this ambitious work could be undertaken with the support of the Académie des Sciences and the Journal des Sçavants. My paper will analyse the French context by focusing to outline the role which the Académie de France had both in France, as the medium of dissemination of the new philosophy despite censorship, and abroad, in particular through the relationship with the Royal Society in England. I aim to analyse the role of the Journal des Sçavants as a means to share ideas other than by correspondence and as a trait d’union between “rationalist France” and “empiricist England”. I intend to question whether it is possible to establish a connection between the empirical interpretation of French Cartesianism, the consolidation of the Académie de France and the employment of new means of academic communication. The paper will show that the second half of 17th century France represents a remarkable exception to the conventional picture, which states that in 17th century Europe, following the success of a mechanistic interpretation of reality, two philosophical school clashed: rationalism, predominating on the continent, and empiricism, in England.