Despite contemporary criticisms, Jennings' work is accepted as authoritative in its field. Alongside his history, the book's discussions extend to the Kabbalah, Gnosticism, the Druids, and ancient and medieval cultures. The work is invested in revealing the presence and philosophy of the Rosicrucians across times and cultures.
Jennings' history joins the nineteenth-century debates that sought to determine the relationships between modern science, religion, and the supernatural.
