 One view is that since Descartes’ eternal truths are neither finite mental things, finite physical things, nor God, they must be something akin to Platonic  forms.[21]  A problem with this view, of course, is that it does violence to Descartes’ parsimonious dualism. Another problem with the view is that Descartes says that eternal truths are beings which “have no existence outside our thought” (Principles I.48, AT 8A:23, CSM 1:208).