Aristotle’s Metaphysics is foundational for the philosophical study of those speculative objects that extend beyond the realm of natural science: being, unity, goodness—Aristotle here begins the scientific treatment of what transcends the physical. St. Thomas Aquinas’s justly renowned commentary, written at the peak of his scholarly life, illuminates what is obscure in Aristotle’s text and guides readers through passages that are often dense and impenetrable. Available for the first time in a bilingual edition, complete with Aristotle’s Greek, The Aquinas Institute here presents its lovingly prepared edition, perfect for students and scholars alike. In this second volume, Thomas’s comments on bks. 7–12 of the Metaphysics, which study substance, potency and act, and unity, before concluding with a consideration of the first and highest cause.