"On Being and Essence" is a philosophical treatise that delves into the complex concepts of essence and existence, primarily focusing on the distinctions and relations between the two within the context of Scholastic metaphysics. The work systematically explores how substances are composed of essence and existence, how these components relate to each other, and how they contribute to an entity's being. The treatise also examines the attributes of different beings, particularly distinguishing between material and immaterial substances, and discusses the implications of these distinctions for understanding the nature of reality and the existence of God. Through rigorous analysis, the text seeks to provide a foundational understanding of metaphysical structures, which underpin the scholastic theological and philosophical tradition.

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