Complete in itself, this volume originated as a commentary and expansion of Manly P. Hall's masterpiece of symbolic philosophy, The Secret Teachings of All Ages. In Lectures on Ancient Philosophy, Manly P. Hall expands on the philosophical, metaphysical, and cosmological themes introduced in his classic work, The Secret Teachings of All Ages. Hall wrote this volume as a reader's companion to his earlier work, intending it for those wishing to delve more deeply into the esoteric philosophies and ideas that undergird the Secret Teachings. Particular attention is paid to Neoplatonism, ancient Christianity, Rosicrucian and Freemasonic traditions, ancient mysteries, pagan rites and symbols, and Pythagorean mathematics. First published in 1929-the year after the publication of Hall's magnum opus-this edition includes the author's original subject index, twenty diagrams prepared under his supervision for the volume, and his 1984 preface, which puts the book in context for the contemporary reader.