 Following what was then the dominant Aristotelian view, he treats the agent intellect as a single, separate, eternal substance, and spends little time arguing for this doctrine, or even explaining how it “illuminates” imagined intentions (LongAnima III.17–18; Davidson 1992, pp. 315–18). In contrast, he discusses the material intellect at length in various treatises, with his views evolving dramatically over time (see Taylor 2009). Here we focus only on his final considered view of the subject, as set out in the Long Commentary, according to which the material intellect, like the agent intellect, is a single, separate, eternal substance (LongAnima III.5).