Bhakti is recognized as one of the three major paths for the realization of ultimate truth in Indian Religious Literature; other two paths are Jnana and Karma. The origin of Bhakti is traceable in Vedic Mantras and its development as an institution also traceable before B.C. Here in this book Bhakti, its origin its major principles and its discussion in Narada-Bhakti-Sutra, Sandilya-Bhakti-Sutra, Bhagavad-Gita as well as Bhagavata Purana etc. are dealt in detail with proper quotations from the original works. The Contribution of Adi Shankaracharya, Ramanujacharya, Vallabhacharya, Narsimha Mehta, Kabir etc. is also examining in this book. Hope this book will prove interesting and helpful to scholars of the subjects and common reader alike.