"Ethics" is the fourth part of the Ukrainian-language edition of Baruch Spinoza's philosophical treatise. In this part, the author examines the concept of a person, the relationship to oneself and others, as well as the role of justice and morality in our lives. Spinoza uses clear logical thinking and argumentation to prove his thesis that true happiness and freedom lie in understanding oneself, the world, and other people. This book will be an important source of information for anyone interested in philosophy and ethics.