Under the title Metaphysics, or Of Those After Physics, is presented one of the most important works of the Stagirite ancient Greek philosopher Aristotle, as well as one of the most significant works of antiquity in general.

This fourteen-volume work of Aristotle constitutes the first scientific investigation into the first principles and causes (causality) from which various beings derive their essential existence. It is the first work of metaphysics in history.

Book A: Wisdom is knowledge of the principles and causes. What the Pre-Socratic philosophers said about two causes: the material and the poetic cause. Critique of the Pre-Socratics. Critique of the Platonic theory of ideas. Conclusion. The concept of truth. The four causes. Our attitude towards knowledge.

Book B: Questions concerning basic ontological concepts: causes, principles, substance.

Book C: The subject of Ontology: the being as being. The logical principles of contradiction, excluded middle, and sufficient reason.

Book E: The subject of Ontology. The meanings of the word "being." Causal relevance. Truth and falsehood.

Book Z: What being and substance mean. The four meanings of "substance." The what-is-that-has-always-been. Generation, production, change. The relationship between definition and substance. A universal concept is not substance.