Srila Bhaktisiddhanta Sarasvati Thakura altered the course of religious history by reviving and forcefully propagating pure Krsna consciousness. His boldness in combating cheating religion earned him the appellation Lion guru � yet his heart was soft with divine love for Krsna. Based in Bengal and traveling throughout India in the early twentieth century Srila Bhaktisiddhanta Sarasva Thakura laid the foundation for and was the inspiration and guiding force behind the later worldwide spreading of the Hare Krsna movement. Replete with anecdotes told by disciples who lived with him this devotional philosophical, cultural and historical study gives intimate insights into the activities, teachings, and character of an empowered emissary of the supreme lord. Preface - From my initial days in devotional life I was fascinated by the personality of Srila Bhaktisiddhanta Saraswati Thakura. I often reflected on the painting of him in the ISKCON temple at Bury place, London, his serious gaze as if descending directly from Goloka Vrndavana. He was known as a lionlke guru fro his power in combating no devotional theories. Who would not be impressed by his erudition strictness, austerity, fearless dedication to truth, unflinching devotion to the lotus feet of Sri Caitanya Mahaprabhu and Sri Sri Radha Krsna and unveering preaching of their glories?Our own spiritual master, his divine grace A.C. Bhaktivedanta Swami Prabhupada another empowered acarya through his unbreakable bond of devotion to this gurudeva Srila Sarasvatu Thakura has linked us eternally to him and the entire parampara.There is no intrinsic difference between the teachings of Srila Bhaktisiddhanta Sarasvati thakura and those of his divine grace A.C. Bhaktivedanta Swami Prabhupada. Considering this and that Bhaktivedantavani is perfect and complete one may question the necessity of studying bhaktisiddhanta vani. In reply we should understand the principle that the guru is one yet manifests in multiple forms each a distinct individual with a specific and unique contribution. All acaryas deliver the same message but with differing style and emphasis. No guru is self made but is dependent on and to be understood in terms of the Parampara he represents. Without clear understanding of these subtle points of guru tattva no one can be a genuine sisya hence for spiritual progress it is essential to learn in depth and from an authorized source about the character activities and teachings of previous acaryas.