International Society for Krishna Consciousness (ISKCON)
It is based on the Bhagavad-gita, the spiritual teachings spoken by Lord Krishna. According to many writings, this sacred text is over 5,000 years old, and it documents the conversation between Lord Krishna and his close friend and disciple, Arjuna.
ISKCON traces its spiritual lineage directly to the speaker of this sacred book, Lord Krishna, who is revered as the Supreme Personality of Godhead. The text teaches that the goal of life is to develop love of God, or Krishna. Love of God is realized through the practice of bhakti-yoga, the science of devotional service.