ABSTRACTIn answering the circularity charge, Descartes consistently distinguished between truths whose demonstrations we currently perceive clearly and distinctly and truths whose demonstrations we merely remember having perceived clearly and distinctly. Descartes uses C-truths to prove God’s existence, thus validating R-truths. While avoiding one form of circularity, this introduces another circle, for Descartes believes that God’s existence validates R-truths even when itself an R-truth. I consider Newman and Nelson’s grounds enhancement strategy according to which this problem is solved when God’s existence (...) is rendered axiomatic. I argue that since it is still possible to doubt axioms when not directly apprehending them, this strategy cannot work; having to reproduce the argument for God’s existence in face of sceptical doubt is unavoidable. Drawing both on Newman and Nelson’s notion of grounds enhancement and on repr... (shrink)