Commentary on the First Book of Euclid's Elements

For this dianoia discursive reasoning is secondary to nous intellect and to the highest science, but is more perfect, accurate, and pure than opinion. For it moves through and unfolds the lack of measure in the intellect and unrolls what is gathered in the intellectual projection, but then again gathers what was divided and refers it back to the intellect. Just as, therefore, forms of knowledge are separated from one another, so too are the objects of knowledge distinguished by nature. Intelligible things are spread over all things by their unified existences, while sensible things are left behind by all the primary substances. Mathematical things, and in general discursive things, have inherited a middle rank, abounding in division compared to the former, but exceeding them in immateriality; falling short in simplicity compared to the former, but having an advantage in precision; having clearer reflections of the intelligible substance than sensible things, yet being images nonetheless, and, in a divisible way, representing the indivisible, yet in a manifold way imitating the uniform patterns of existing things.

A marginal note provides a hierarchy of knowledge:

Marginal note: Knowledge according to Plato.