Note 149 — Chapter VI · ON THE THIRD CLASS OF OBJECTS FOR THE SUBJECT AND THAT FORM OF THE PRINCIPLE OF SUFFICIENT REASON WHICH PREDOMINATES IN IT.

Aristot. "Metaph." i. 6, with which compare x. 1. "Further, says he, besides things sensible and the ideas, there are things mathematical coming in between the two, which differ from the things sensible, inasmuch as they are eternal and immovable, and from the ideas, inasmuch as many of them are like each other; but the idea is absolutely and only one." (Tr.'s Add.)