A Treatise of Human Nature was published between 1739 and 1740. Book I, entitled Of the Understanding, contains Hume's epistemology, i.e., his account of the manner in which we acquire knowledge in general, its justification (to the extent that he thought it could be justified), and its limits. Book II, entitled Of the Passions, expounds most of what could be called Hume's philosophy of psychology in general, and his moral psychology (including discussions of the problem of the freedom of the will and the rationality of action) in particular. Book III, entitled Of Morals, is also divided into three parts. Part II of Book III, entitled Of justice and injustice, is the subject of the present volume. In it Hume attempts to give an empiricist theory of justice. He rejects the view, approximated to in varying degrees by Cumberland, Cudworth, Locke, Clarke, Wollaston, and Butler, that justice is something natural and part of the nature of things, and that its edicts are eternal and immutable, and discernible by reason. Hume maintains, on the contrary, as did Hobbes and Mandeville, that justice is a matter of observing rules or conventions which are of human invention, and that, in consequence, our acquiring a knowledge of justice is an empirical affair of ascertaining what these rules or conventions are.

In this volume, Kieran McGroarty provides a philosophical commentary on a section of the Enneads written by the last great Neoplatonist thinker, Plotinus. The treatise is entitled "Concerning Well-Being" and was written at a late stage in Plotinus' life when he was suffering from an illness that was shortly to kill him. Its main concern is with the good man and how he should pursue the good life. The treatise is therefore central to our understanding of Plotinus' ethical theory, and the commentary seeks to explicate and elucidate that theory. Plotinus' views on how one should live in order to fulfill oneself as a human being are as relevant now as they were in the third century AD. All Greek and Latin is translated, while short summaries introducing the content of each chapter help to make Plotinus' argument clear even to the non-specialist.

Meaning (significance) and nature are this book's principal topics. They seem an odd couple, like raisins and numbers, though they elide when meanings of a global sort-ideologies and religions, for example-promote ontologies that subordinate nature. Setting one against the other makes reality contentious. It signifies workmates and a coal face to miners, gluons to physicists, prayer and redemption to priests. Are there many realities, or many perspectives on one? The answer I prefer is the comprehensive naturalism anticipated by Aristotle and Spinoza: "natura naturans, natura naturata." Nature naturing is an array of mutually conditioning material processes in spacetime. Each structure or event-storm clouds forming, nature natured-is self-differentiating, self-stabilizing, and sometimes self-disassembling; each alters or transforms a pre-existing state of affairs. This surmise anticipated discoveries and analyses to which neither thinker had access, though physics and biology confirm their hypothesis beyond reasonable doubt. Hence the question this book considers: Is reality divided:nature vrs. lived experience? Or is experience, with all its meanings and values, the complex expression of natural processes?