Excerpts from the 1996 translation by J. O. Urmson, with page numbers of the translation.
From the opening
(p. 15)
"The primary and most important object of concern is the truth about things themselves, both about other things and concerning the soul, which is the most relevant of all for us. Second to this is awareness of the opinions of those who have reached the summit of scientific knowledge. That is why I think it necessary to study very carefully Aristotle’s work On the Soul. Indeed, many divine insights about the soul have been handed down by Plato also; but these have been studied and clarified by Plato’s interpreters sufficiently and with unanimity. But, while Aristotle brought the study of the soul to completion, as is the opinion of Iamblichus, that excellent judge of truth, there is much dissension among those who explain his work, not merely about the interpretation of Aristotle’s text, but also greatly about the subject-matter itself.
That is why I myself decided to investigate and write of the consistency of the philosopher both with himself and also with the truth. I shall avoid rejoinders to others, but confirm my views on doubtful matters from the clear opinions and statements of Aristotle. Everywhere I shall strive to the uttermost for the truth about things in accordance with the teaching of Iamblichus in his own writings about the soul. That is my sole concern. And now, under the Guide who is the cause of all souls and all reasoning, let us start upon the projected work."
The study of the soul is partly physical, partly metaphysical
(p. 16)
"[W]hatever is intellective is the province of first philosophy, which is cognisant of the intelligible and of the intellect which contemplates the intelligible – not only transcendent intellect but also that in us. For things THERE are intelligible to intellect in us, and the intellect and the intelligible, being correlatives, are studied by one and the same discipline, as are the sensitive and the sensible. So the study of the soul is neither simply natural nor simply metaphysical, but belongs to both, as was determined by Aristotle[.]"
On the same
(p. 17)
"Or, it may be put in another way, which the text will make clear, when Aristotle also investigates the same matter: summing up, Aristotle, in the passage before us says: ‘So it is clear that we (natural
scientists, obviously) are not to speak of all soul; for not all soul is natural, but some one or more parts of it.’ Since he himself includes the intellect of the soul in his discussions and not only the natural parts, it is clear that the investigation of the soul is not entirely natural. So let that be our conclusion."
Aristotle's De anima is only about the souls of mortals, not the gods
(p. 17)
"But the scope of the investigation seems to include only the soul of mortal animals. For he seems to take no account of the soul of the heavenly beings, except so far as in his strictures on the mathematical demonstrations about it in the Timaeus. Perhaps he was satisfied with the Platonic insights about it as sufficient, merely commenting that one should not rely on what appears from mathematics. Perhaps also he judged that it was fit to refer to the heavenly soul by what was said about the sublimity of our intellect. ‘For’, he says, ‘it is clear that he <Plato> intends the soul of the universe to be such as is the so-called intellect. For it is not like the sensitive or desirous element.’ For the soul of the universe is pure and intellective reason, wholly and throughout unmixed with secondary lives, because it does not itself come to belong to bodies, but they <come to belong> to the
soul, while it remains at rest in itself. Therefore its travel is circular because of its reversion, whole to whole, upon itself. Also he clearly is not concerned with the various destinies of the human soul nor
most of the choices among ways of life, knowing that the account of these matters has been sufficiently worked out by our leader. But he does not take the soul to be inseparable from the body; for he gives the explanation of our not remembering separated life in Book 3, clearly as existing before our arrival into bodies. Studying primarily the soul of mortals alone, he leaves not one of
its powers and character uninvestigated."