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Gaurkishor Dās Bābājī was the spiritual master or guru of Swami Vivekananda. Bābājī was a devotee of the Hindu god Vishnu and was known for his teachings on Vedanta philosophy. He was also a strong advocate of social reform and worked to improve the lives of women and the poor. Swami Vivekananda was inspired by Bābājī's teachings and worked to spread his message of Vedanta philosophy throughout the world.