The Earth from which the Stones were cut cannot be Eternal.

And this Earth from which the Stones are cut is not [L. 26.] essentially such that is uncomposite, and also incapable of being cut up. For a thing which is not composite cannot be cut. For a composite nature can be dissolved. But if it can be cut . . . And if it has these (qualities) in its nature, it has no (immutable) Essence in its nature, and it shows that the natures which (spring) from it are composite creations. For that Grave is built, it is certainly composed and . . . But if [L. 40.] the Architect of the work is skilled in building it is right that it should be put together cunningly. These Stones, [P. 94, l. 8.] therefore, which were compounded there show concerning the Earth from which they were cut, that it also is a composite nature.