A compilation of essays commemorating the centenary of Mohammad Natsir (1908–1993), this book explores the dual nature of his legacy as a prominent Indonesian statesman, scholar, and religious leader. It meticulously analyzes his philosophical stance that politics and Islamic proselytization (dakwah) are inseparable components of societal development. The text examines his strategic navigation within formal governance as the leader of the Masyumi Party and Prime Minister of Indonesia, alongside his subsequent grassroots educational and social initiatives through the Dewan Dakwah Islamiyah Indonesia (DDII). Contributed by prominent Malaysian and Indonesian intellectuals, the chapters highlight Natsir's enduring influence on modern Islamic political thought, regional cooperation, and his model of ethical, moderate Muslim leadership in Southeast Asia.