The philosopher René Descartes famously pondered the question of the possibility of God’s deceit. If God was deceitful, we as his creations could never trust anything we contemplate or perceive; it may simply be a deceitful, omnipotent God directly warping our faculties or, as our creator, deliberately constructing us with faulty, unreliable faculties to start with. To dodge this disturbing possibility, Descartes argued that God, a perfect being, could not be deceitful because deceit is a fault, an imperfection. This simple stratagem appeared to satisfy Descartes. But was Descartes on to something more insidious and unthinkable than he was willing to contemplate; was he too hasty in sweeping this concern under the rug?