In the philosophy of Aristotle the soul (psyche) of a body is what makes it alive, and is its actualized form; thus, every living thing, including plant life, has a soul. The mind or intellect ("nous") can be described variously as a power, faculty, part, or aspect of the human soul. For Aristotle, soul and "nous" are not the same. He did not rule out the possibility that "nous" might survive without the rest of the soul, as in Plato, but he specifically says that this immortal "nous" does not include any memories or anything else specific to an individual's life. In his "Generation of Animals" Aristotle specifically says that while other parts of the soul come from the parents, physically, the human "nous", must come from outside, into the body, because it is divine or godly, and it has nothing in common with the "energeia" of the body. This was yet another passage which Alexander of Aphrodisias would link to those mentioned above from "De Anima" and the "Metaphysics" in order to understand Aristotle's intentions.