The Sixth Objections, like the Second Objections, were collected by Father Marin Mersenne, and purport to represent the views of the group of philosophers and theologians who belong to the so-called Mersenne circle. The very first objection that Mersenne and his friends make to the Meditations in the Second Objections concerns the real distinction between mind and body; Mersenne and his friends simply do not understand how Descartes' arguments exclude the possibility that thought is not a kind of motion, and why a body cannot think (AT VII 123). Descartes, of course, attempts to answer this question in the Second Replies (as well as in the Third and Fifth Replies), but evidently not to Mersenne's satisfaction. For in the Sixth Objections, the very same question is raised yet again (AT VII 413). Mersenne goes on to suggest that even the Church Fathers believed that thought “could occur by means of corporeal motions” (AT VII 413). The Sixth Objections ends with an appendix and a letter “from some philosophers and geometricians to M. Descartes” in which these very same doubts are voiced again: