Light on Ancient Worlds, first published in 1967, is a central example of Frithjof Schuon's thought. This new edition is fully revised and contains an Index and a valuable glossary which clarifies many key ideas expressed in Sanskrit, Latin, Greek, and Arabic, as well as foreign phrases. It also includes a selection of previously unpublished correspondence, which provides striking insights into Schuon's function as one of the great spiritual masters of our time.