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The concept underlying Ayer's discussion is the "principle of verifiability," which defines a statement as being "literally meaningful" only if it either is logically necessary ("analytical") or can be empirically verified as being either true or false. Under this definition, metaphysical statements are not literally meaningful, and so are properly part of theology rather than philosophy.
Ayer believes that many philosophical debates (such as those about ethics or about the nature of the soul) stem from arguing about metaphysical statements as if they were literally meaningful. He believes that once metaphysics has been eliminated from philosophy, these debates will seem silly and the questions that underlie them will be recognized as theological rather than philosophical. So once he has established the principle of verifiability and explained how he identifies statements as either verifiable or analytical, Ayer spends the rest of the book applying this principle to various "philosophical" questions.
Of course, the place of metaphysics in philosophy is itself debatable. Ayer's conception of philosophy is relatively narrow, and many readers will prefer a wider definition of philosophy that includes some (or all) of the metaphysical statements that he banishes. Others will be thrilled to finally read a philosophical work that cuts through the mystical goo spread so liberally and destructively by other thinkers.
... Read more ›Ayer's project here is the project of all young philosophical radicals--solving all the problems of philosopher, or at least showing that there were no real problems that needed to be solved. In less than two hundred pages of lucid prose Ayer gives you a brief statement of the central assumptions of the doctrine and a demonstration of how it can be applied to problems in nearly every area of philosophy. Needless to say, in Ayer's hands it appears to work wonders wherever it's put to work.
Ayer's positivism, as he himself admitted, was really an updated version of Hume's radical empiricism.
... Read more ›It gets three stars because Ayer, unlike some of his Continental brethren, wrote clearly enough to be found out. While this book is of tremendous historical importance, its philosophical content should be evaluated only after one has read Brand Blanshard's _Reason and Analysis_, which put paid to the misbegotten "verifiability theory of meaning" and demonstrated once for all that logical positivism could not pass its own tests.