With this book the author moves from what Aristotle and Aquinas called the order of practical studies to the theoretical. At their highest levels it is from the ethical to the metaphysical. To the modern mind, if the consideration of morality or ethics is hardly relevant in the study of science the consideration of ontology or metaphysics is even less so. Indeed, any principles or conclusions put would almost universally be regarded as quite unscientific.

What the author wishes to show in this book is that this modern mental position could not be further from the truth. A close study of Aristotle shows, and Aquinas clearly demonstrates, that all human science and knowledge depends upon what we can know from Metaphysics. The core of this study, which is given the name “Ontology”, from the Greek to on (Latin ens), rather loosely rendered in English as “being”, is all contained...