 Averroes recalls that in De caelo (in particular I.5–7) Aristotle had stated that the potentiality of the heavenly body was finite. An active, moving potentiality can be said to be infinite in two aspects: because its activity never ceases or because it produces motion at an infinite velocity, so that there cannot be any higher velocity. The heavenly spheres rotate at different velocities, therefore their motions are finite in the second aspect, i.e., in intensity, and they are not caused by an infinite potentiality. Averroes infers that Aristotle intended this meaning of ‘finite’ when he spoke of finite potentiality in the heavens (LC 427BD; Davidson 1987: 321–331).