Hans Lassen Martensen’s Jacob Boehme: His Life and Teaching, or Studies in Theosophy (1882) provides a sympathetic yet critical analysis of the 17th-century German mystic. It explains Boehme's view of the Divine as a dynamic process—the "Ungrund" (abyss)—exploring how light and darkness, good and evil, are necessary for divine self-manifestation. The book is recognized as a key study that brought Boehme's work into wider scholarly and philosophical discourse, highlighting his focus on inner spiritual life and the cosmic process.