In chapter 11, Seneca introduces the figure of the Stoic sage, whose peace of mind (ataraxia) springs directly from a greater understanding of the world. The sage's complete security and self-sufficiency exclude the unhealthy passions (apatheia), i.e. disturbances which cannot upset the person who is, by definition, rational. Only reasoning, caution, and foresight can create in someone the ideal atmosphere of peace. The philosopher, while preserving his peace of mind, does not hate humanity for its injustice, vileness, stupidity and corruption. The times we live in are no worse than the preceding ones, it is not reasonable to waste time raging about these evils, it is more reasonable to laugh at them (chapter 15).
