This book is about the life and works of Arnold Janssen: how from his youth he was indirectly prepared for the task of missionary service. It relates to us the history of a lifelong preparation since his youth, the founding of the mission house in Steyl, the development of the Society of the Divine Word and different houses as they came about, the founding and the rising of the sisterhood of Steyl the Servants of the Holy Ghost, the missions of the Society of the Divine Word around the world.