Ethics Part III offers a deeply analytical exploration of human emotions, their causes, and their connection to rational understanding. Framed through a structured and logical framework, the treatise seeks to explain how emotional experiences arise from the same natural order governing all existence, rather than from moral imperfection. The work begins with a critique of earlier interpretations of human passions and challenges the tendency to view emotions as irrational or corrupt. Through a reasoned, almost mathematical method, it defines core emotions such as love, hate, and desire as understandable outcomes of causal processes. The text argues that recognizing these emotional origins enables individuals to attain clarity and self-mastery. By uncovering how thoughts and feelings interact, the treatise suggests that true freedom comes not from suppressing emotions but from perceiving their natural necessity. This philosophical section thus bridges metaphysics and ethics, presenting human nature as a subject open to rational comprehension and promoting a disciplined path to moral understanding.