Here it is requisite to reflect somewhat with regard to a comparison which exists between the order of the Heavens and that of the Sciences Wherefore, as has been previously described, the Seven Heavens next to us are those of the Planets; then there are two Heavens above these, the Mobile, and one above all, Quiet.

To the Seven first correspond the Seven Sciences of the _Trivium_ and of the _Quadrivium_, namely, Grammar, Logic, Rhetoric, Arithmetic, Music, Geometry, and Astrology.

To the eighth Sphere, i.e., to the starry, correspond Natural Science, which is termed Physics, and the first Science, which is termed Metaphysics.

To the ninth Sphere corresponds Moral Science; and to the Quiet Heaven corresponds Divine Science, which is designated Theology.
And the reason why this is, remains briefly to be seen.

I say that the Heaven of the Moon is likened unto Grammar because it is possible to find a comparison to it.