  In Part 1, chapter three of the Supplément, Desgabets explicitly examines Descartes’s rejection of the empiricist motto, that all knowledge comes from the senses. While Desgabets rejects the Scholastic rendering of the motto, he is equally critical of Descartes’s precipitous rejection of it. According to Desgabets, the proper sense of the empiricist motto is that all thoughts originate by the senses [a sensu] rather than in the senses [in sensu], and what reaches the intellect is not what is found in the senses. As Lennon nicely puts it, “For him things are directly perceived and an idea is the means by which, and not in which, a thing is perceived” (Lennon, 1998, p. 353). The soul must always be in commerce with the senses, and although our thoughts depend on the corporeal traces in the brain for their source or origin, it does not follow that our ideas must be corporeal, or even similar to corporeal things. The very fact that all of our thoughts have a beginning, duration, cessation, and sucession proves that they depend on motion, and motion is only communicated through the senses. This is why he modifies the empiricist motto from: nihil est in intellectu quin prius fuerit in sensu, to a sensu.