Knowledge and Morality

Once Descartes' thought experiment becomes a potential arena for the conflicting influences of his deity and a malicious demon, the exercise takes on Moral significance.  Later, he develops the issue, when identifying Will as the Subject of such a conflict, implying that Error and Sin are one and the same, and, hence, that Knowledge and Salvation are one and the same.  In other words, what is now commonly classified as an Epistemological theory is originally a Moral doctrine, in which Knowledge is the Highest Good.  Likewise, his quest for Certainty is a Moral endeavor.  Now, it seems that he has thus established that his previous theses regarding Scientific Method and Geometry can be trusted, i. e. because his deity would not deceive him about such apparent truths.  Hence, he seems to have established that they are not sinful, significant given the fate of Galileo regarding Heliocentrism.  Thus, Morally, i. e. Deontically, they are Permissible, but not Obligatory, as they would be if derived from Kant's principle, i. e. as a case of cultivating one's talents, which is a Duty on that basis.  Accordingly, Science and Geometry are of no special interest to Descartes' deity, and, hence, of no particular positive Theological value.  Thus, the entire subsequent history of technical developments that is based on Descartes' innovations are extrinsic to whatever plan his deity might have for the species.