Now the question is, Is there such a thing as a necessary existent, or are all existents merely possible?
As all existents are divided into substance and accident, the soul must be either the one or the other.
There is nothing practical in this contemplation, it is just the knowledge of existents and their causes.
Themistius says it is not any of the existents actually, but a potential essence receiving material forms.
But this "union" is not essential to all existents; for we have seen that its function is to unite accidents with body.