"Ethics" is a philosophical work that explores complex ideas about God, the universe, human emotions, and the path to enlightenment. The book outlines a metaphysical, epistemological, and ethical system in which God and the universe are one and the same, rejecting traditional notions of a personal deity and asserting that understanding the natural world leads to peace of mind and happiness. The work delves into the nature of the human mind and its emotions, advocating for the pursuit of reason and knowledge to achieve a calm, enlightened state.

"Metaphysics" is a philosophical work that delves into the fundamental nature of reality, including the relationship between matter and substance, potentiality and actuality, form and matter, existence and essence, and the underlying principles of being. It also explores the concept of 'first philosophy' or 'wisdom', and the existence of God as an unmoved mover. The book is a profound exploration of ontology, causality, and the abstract concepts of being and knowing.

"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.