As for the first mover, it could not itself be a body, since if it were, it would have to have motion of itself (for as first mover, where else would it get it?), and this has been shown to be impossible for bodies. Thus we may also conclude that the first mover is not a body. But there being only two kinds of substances (Cordemoy’s third axiom), bodies and minds, only a mind remains as a candidate for the first mover. Further, it is clear that our (finite) minds are not the source of motion in