During the early seventeenth century, Europe was suddenly embroiled in controversy after the publication of the first Rosicrucian texts. Ever since, Rosicrucianism has been at the center of Western Christian esotericism. Forced underground by the Thirty Years War, it was secretly handed down by alchemists, hermeticists, and Masons to the nineteenth century, when it inspired new spiritual movements such as Theosophy, the Order of Golden Dawn, and Rudolf Steiner's Spiritual Science.

The Secret Stream collects all of Steiner's discussions of the Rosicrucians, answering...