Descartes, Divine deception, First Meditation, Suarez.

Post-Cartesian Occasionalism argues that the power of causing an effect depends on knowledge of the means by which the effect is produced. The argument is used to deny finite beings the power to act. Arnold Geulincx expresses this thesis in the principle Quod nescis quomodo fiat id non facis. Here, my purpose is to show that: 1. The philosophical problem that is at the origin of the principle Quod nescis quomodo fiat id non facis originates in Galen’s De foetuum formatione, (...) a work translated into Latin only in 1535. 2. Important works of early modern philosophy, such as Campanella’s Del senso delle cose e della magia, discuss Galen’s text. 3. Due to their rejection of teleology, Descartes’ physics and metaphysics are completely foreign to the Quod nescis principle. Comparing the Cartesian theory of animal-machines with the theory of animal behavior of Pierre Chanet, a philosopher who adopts the principle, confirms this claim. (shrink)

The physician Louis de La Forge built his entire work upon the promotion, defensce, and completion of Descartes’ thought. In the course of this endeavor, he sought to refute the notion that knowledge of the mechanisms of the living body is the necessary condition for producing such mechanisms. Around the same time, Arnold Geulincx formulated the principle Quod nescis quomodo fiat id non facis, according to which an effect can only be produced only by someone who knows how it is (...) produced. Geulincx developed this principle within a Cartesian framework, and it soon became a cornerstone of arguments supporting oOccasionalism from a Cartesian perspective. La Forge instead upheld the opposite thesis, yet still on the basis of ideas drawn from Cartesian philosophy. In doing so, La Forge intended to defend Descartes’ physiology against a form of vitalism which was fueling the opposition to Cartesian science in Parisian philosophical and scientific circles, and which found a prominent champion in the physician Cureau de La Chambre. (shrink)

In his remarks on L’Homme, La Forge aims at a rigid separation of the functions of the body from the activity of the soul. This project looks authentically Cartesian, but some critical issues reveal how difficult it is taking away any activity of the soul in sensitive experience. In the Traité de l’esprit de l’homme, La Forge explicitly limits the cognitive capability of the memory without the active presence of the mind.