Henry Manampiring’s Filosofi Teras (2018) explores the relevance of Stoicism in addressing the challenges of modern life. This study aims to analyze the book's content using a descriptive qualitative method with the note-taking technique. The book provides practical guidance for readers to manage emotions, overcome anxiety, and enhance mental resilience. Based on the analysis, the book effectively simplifies Stoic concepts for a broader audience, though it has certain limitations, such as a lack of in-depth discussion on original Stoic philosophy. This research offers insights into how this work became a popular self-help book in Indonesia.