"Lysis" is a philosophical dialogue written by one of the greatest philosophers of Ancient Greece, Plato. In this book, the author reflects on the concepts of friendship, happiness and the task of a person in society. The dialogue unfolds around the communication of Socrates' students - Lysias and Hippo. The author tries to explore the essence and nature of friendship and show that true friendship requires not only common interests, but also mutual respect and help for each other's self-realization. "Lisius" is considered one of the key works of ancient philosophy, which will interest all seekers of truth and deeper reflections on life.