This book fulfills a longtime need for a comprehensive introduction and commentary in the English language for one of Yoga s greatest source works: the Tirumandiram or Holy Garland of Mantras, described by Dr Georg Feuerstein, Ph.D as important as the Yoga-Sutras of Patanjali, the Bhagavad Gita and the Yoga-Vashistha combined. Tirumandiram is considered to be the greatest and earliest seminal work of the Siddhas, the greatest adepts of Yoga, and an encyclopedia of philosophical and spiritual wisdom rendered in verse form. It is a book of Yoga, tantra, alchemy, mysticism, mantra, yantra and philosophy. But without a commentary, it has been difficult for most English readers, unfamiliar with much of its underlying philosophical concepts, to clearly understand. This new book explains clearly the most important themes and philosophical concepts which are woven throughout the Tirumandiram. With an understanding of the basic ideas, the reader will then be stimulated to make a detailed study of the Tirumandiram itself.