The King of Knowledge (Raja Vidya) -- A.C. Bhaktivedanta Swami Prabhupada
His Divine Grace A.C. Bhaktivedanta Swami Prabhupada
Founder-Acarya of the International Society For Krishna Consciousness

Raja-vidya means "the king of knowledge". If you learn this knowledge, then you become completely freed from the conditioned stage of this material world. Therefore it is called raja. Raja means king, and vidya means knowledge.

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