One.- I. Literary and Chronologicale Aspects of the Commentary.- 1. Medieval Latin versions of the Metaphysics.- 2. The chronology of the composition of the Commentary.- II. The Metaphysical Views of Avicenna, Averroes, and Albert.- 1. Avicenna’s First Philosophy.- 2. The Commentary of Averroes.- 3. The Commentary of Albert.- III. The Prooemium to Aquinas’ Commentary.- 1. The doctrine of the Prooemium.- 2. The idea of ens commune.- 3. The doctrine of the via resolutionis.- 4. The introduction to Albert’s Commentary.- 5. The introductory book of Avicenna’s Metaphysics.- 6. Aristotle’s introduction.- 7. Conclusion of Part One.- Two.- IV. The Object of Metaphysics.- 1. The doctrine of Aquinas’ Commentary on the objects of metaphysics.- A. In IV Meta., lectio 1.- B. In IV Meta., lectio 2.- 2. Aristotle, Averroes, Albert: the predecessors of Aquinas’ In IV Meta., lectio 1.- A. Aquinas and Aristotle.- B. Aquinas versus Averroes and Albert.- 3. Aristotle, Averroes, Albert: the predecessors of Aquinas’ In IV Meta., lectio 2.- A. Aquinas and Aristotle.- B. Aquinas versus Averroes and Albert.- 4. Avicenna’s and Aquinas’ expositions of the object of metaphysics.- A. Avicenna’s metaphysics.- B. The fundamental criticisms of Avicenna given by Averroes, by Albert, and by Aquinas.- C. Aquinas’ use of several less important aspects of Avicenna’s metaphyscis.- 5. Conclusion.- V. The Relation of Metaphysics to the Other Sciences.- 1. The thought of Aquinas.- A. The “universal science” and the “first science”.- B. The study of communia.- C. Metaphysics as the “lord” of sciences.- 2. “Universal science” and “first science” in the predecessors of Aquinas.- A. The “universal science” and the “first science” in Aristotle’s thought.- B. Averroes and Albert on the identity of the “first science” and “universal science”.- C. Avicenna’s theory on “universal science” and “first philosophy”.- 3. Aristotle, Averroes, Avicenna, and Albert on metaphysics as the study of communia.- A. Aristotle’s doctrine.- B. Avicenna and the study of communia.- C. Averroes and Albert on the study of communia.- 4. Aquinas’ predecessors on metaphysics as the “lord” of all science.- A. Aristotle’s view.- B. Avicenna on metaphysics as the ruling science.- C. Averroes and Albert on metaphysics as the first of the sciences.- 5. Conclusion.- VI. The Method of Metaphysics.- 1. The Commentary’s metaphysics.- A. The birth of metaphysics.- B. Metaphysics and the investigation of predication.- C. The investigation of predication: the concept of “being”.- D. The investigation of predication: the distinction of matter and form.- E. The discovery of the existence of God.- F. The human attempt to speak of God.- G. Conclusions.- 2. Aquinas and Aristotle.- A. Aristotle on the birth of metaphysics.- B. The necessity of using a logical method.- C. The investigation of predication: the concept of “being”.- D. The investigation of predication: the distinction of matter and form.- E. The discovery of the existence of God.- F. The human attempt to speak of God.- G. Conclusion: Aquinas’ Commentary on the Metaphysics.- 3. Conclusion of Part Two.- Three.- VII. The Basic Insight of Aquina’s Commentary.- 1. The meaning of “is”.- 2. Intellectual knowledge.- 3. The meaning of “being”.- 4. The transcendental concepts.- 5. Metaphysics, the ruling science.- 6. Philosophical knowledge of God.- 7. Conclusion.- Conclusion.- Conclusion.- Index of Topics.- Index of Texts.