Commentary on the First Book of Euclid's Elements

And to speak briefly, [mathematical things] are stationed in the vestibules of the primary forms, displaying the unified, partless, and generative existence of those forms. Yet they have not yet surpassed the division and composition of the logoi rational principles/forms and the status appropriate to images; nor have they outstripped the manifold and discursive thoughts of the soul, but are fitted to the simple forms of knowledge that are pure of all matter.

Let the intermediate nature of mathematical genera and species be understood in this way, as completing, for the present, the interval between the entirely indivisible substances and those that are becoming divisible around matter. Investigating the principles of the whole mathematical substance, we go up to the principles themselves that run through all existing things and generate all things from themselves; I mean the Limit and the Infinite. For from these two, after the cause of the One—which is beyond description and ungraspable by all—everything else and the nature of mathematics were brought into existence; those [higher principles] producing all things all at once and transcendently, while those that proceed receive this progression in appropriate measures and in the fitting order, with some being established as primary, others as intermediate, and others as final.