 To conclude, when we view Desgabets’s work as a whole, there is no doubt that what he viewed as a revision or perfection of the Cartesian philosophy others have argued are a fundamental departure. In his favor, he never strayed from the Cartesian metaphysics of substance dualism, substance-mode ontology, mind-body union and interaction, and the view that extension is the essence of matter and thought the essence of mind. He remained loyal to the Cartesian physics against the atomists. Moreover, and perhaps heretically to some, he strongly rejected the rationalist epistemology which often dominates in Descartes, and argued that Descartes’s own principles favor a sensory foundation for knowledge.