 Descartes is unambiguous that there are some things that we clearly and distinctly perceive to be possible. To Mersenne he speaks of beings whose existence we clearly perceive to be possible (“To Mersenne, March 1642,” AT 3:544–45, CSMK 211); he also says that God “can bring about everything that I clearly and distinctly recognize as possible” (Fourth Replies, AT 7:219, CSM 2:154). In First Replies he says that