 The passage is often read together with "Metaphysics", Book XII, ch.7-10, where Aristotle also discusses the human mind and distinguishes between the active and passive intellects.In that passage Aristotle appears to equate the active intellect with the "unmoved mover" and God.Sachs comments that the nature of the active intellect was "the source of a massive amount of commentary and of fierce disagreement"; elsewhere, chapter 5 of "De Anima" has been referred to as "the most intensely studied sentences in the history of philosophy".