Bhagavad-gita (Sk.). Lit., “the Lord’s Song”. A portion of the Mahabharata, the great epic poem of India. It contains a dialogue wherein Krishna—the “Charioteer”—and Arjuna, his Chela, have a discussion upon the highest spiritual philosophy. The work is pre-eminently occult or esoteric.
Source: H.P.Blavatsky - The Theosophical Glossary