This collection is dedicated to the fundamental, most important life’s work of Vedanta Deśikan (1268–1370) about the fundamental doctrines, teachings and philosophy of Śrī Vaiṣṇavism. The present classical work is known as Śrīmad Rāhasyatraya Sāram, which could be translated as The Essence of the Holy Three Secrets – referring to the 3 fundamental Secrets-Mantras of Śrī Vaiṣṇavism – Tirumantra, Dvaya Mantra and Charama Shloka -