Composed amid the early twentieth-century occult revival, THE SECRET DOCTRINES OF THE ROSICRUCIANS offers a compact cosmology and a practical psychology of self-culture. In didactic, orderly prose it traces emanation from the Absolute through planes of being, explains rhythm, polarity, and causation, and treats astral phenomena, reincarnation, and mental influence, blending Rosicrucian lore with Hermetic and New Thought frameworks. Attributed to William Walker Atkinson, writing as "Magus Incognito," the book reflects a prolific New Thought educator intent on systematizing esoteric instruction for modern readers. Drawing on his experience popularizing mental discipline and comparative occultism under several pen names, Atkinson recasts lodge teachings into clear lessons, aligning speculative metaphysics with pragmatic counsel on attention, will, and ethical self-mastery. Students of esotericism, religion, and intellectual history will find a lucid synthesis and a revealing primary source; practitioners will find sober guidance shorn of sensationalism. Read it both as a map of Rosicrucian ideas and as a disciplined workbook for reflective practice. Quickie Classics summarizes timeless works with precision, preserving the author's voice and keeping the prose clear, fast, and readable-distilled, never diluted. Enriched Edition extras: Introduction · Synopsis · Historical Context · Brief Analysis · 4 Reflection Q&As · Editorial Footnotes.