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metaphysics, the philosophical study whose object is to determine the real nature of things—to determine the meaning, structure, and principles of whatever is insofar as it is. Although this study is popularly conceived as referring to anything excessively subtle and highly theoretical and although it has been subjected to many criticisms, it is presented by metaphysicians as the most fundamental and most comprehensive of inquiries, inasmuch as it is concerned with reality as a whole.

Nature and scope of metaphysics

Origin of the term

Etymologically the term metaphysics is unenlightening. It means “what comes after physics”; it was the phrase used by early students of Aristotle to refer to the contents of Aristotle’s treatise on what he himself called “first philosophy,” and was used as the title of this treatise by Andronicus of Rhodes, one of the first of Aristotle’s editors. Aristotle had distinguished two tasks for the philosopher: first, to investigate the nature and properties of what exists in the natural, or sensible, world, and second, to explore the characteristics of “Being as such” and to inquire into the character of “the substance that is free from movement,” or the most real of all things, the intelligible reality on which everything in the world of nature was thought to be causally dependent. The first constituted “second philosophy” and was carried out primarily in the Aristotelian treatise now known as the Physica; the second, which Aristotle had also referred to as “theology” (because God was the unmoved mover in his system), is roughly the subject matter of his Metaphysica. Modern readers of Aristotle are inclined to take both the Physica and the Metaphysica as philosophical treatises; the distinction their titles suggest between an empirical and a conceptual inquiry has little foundation. Aristotle was not indifferent to factual material either in natural or in metaphysical philosophy, but equally he was not concerned in either case to frame theories for empirical testing. It seems clear, nevertheless, that if the two works had to be distinguished, the Physica would have to be described as the more empirical, just because it deals with things that are objects of the senses, what Aristotle himself called “sensible substance”; the subject matter of the Metaphysica, “that which is eternal, free of movement, and separately existent,” is on any account more remote. It is also evident that the connection marked in the original titles is a genuine one: the inquiries about nature carried out in the Physica lead on naturally to the more fundamental inquiries about Being as such that are taken up in the Metaphysica and indeed go along with the latter to make up a single philosophical discipline.

The background to Aristotle’s divisions is to be found in the thought of Plato, with whom Aristotle had many disagreements but whose basic ideas provided a framework within which much of his own thinking was conducted. Plato, following the early Greek philosopher Parmenides, who is known as the father of metaphysics, had sought to distinguish opinion, or belief, from knowledge and to assign distinct objects to each. Opinion, for Plato, was a form of apprehension that was shifting and unclear, similar to seeing things in a dream or only through their shadows; its objects were correspondingly unstable. Knowledge, by contrast, was wholly lucid; it carried its own guarantee against error, and the objects with which it was concerned were eternally what they were, and so were exempt from change and the deceptive power to appear to be what they were not. Plato called the objects of opinion phenomena, or appearances; he referred to the objects of knowledge as noumena (objects of the intelligence) or quite simply as realities. Much of the burden of his philosophical message was to call men’s attentions to these contrasts and to impress them with the necessity to turn away from concern with mere phenomena to the investigation of true reality. The education of the Platonic philosopher consisted precisely in effecting this transition: he was taught to recognize the contradictions involved in appearances and to fix his gaze on the realities that lay behind them, the realities that Plato himself called Forms, or Ideas. Philosophy for Plato was thus a call to recognize the existence and overwhelming importance of a set of higher realities that ordinary men—even those, like the Sophists of the time, who professed to be enlightened—entirely ignored. That there were such realities, or at least that there was a serious case for thinking that there were, was a fundamental tenet in the discipline that later became known as metaphysics. Conversely, much of the subsequent controversy about the very possibility of metaphysics has turned on the acceptability of this tenet and on whether, if it is rejected, some alternative foundation can be discovered on which the metaphysician can stand.

Characterizations of metaphysics

Before considering any such question, however, it is necessary to examine, without particular historical references, some ways in which actual metaphysicians have attempted to characterize their enterprise, noticing in each case the problems they have in drawing a clear line between their aims and those of the practitioners of the exact and empirical sciences. Four views will be briefly considered; they present metaphysics as: (1) an inquiry into what exists, or what really exists; (2) the science of reality, as opposed to appearance; (3) the study of the world as a whole; (4) a theory of first principles. Reflection on what is said under the different heads will quickly establish that they are not sharply separate from one another, and, indeed, individual metaphysical writers sometimes invoke more than one of these phrases when asked to say what metaphysics is—as, for example, the British Idealist F.H. Bradley does in the opening pages of his work Appearance and Reality (1893).



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