In this little jewel of a book, based on the Bhagavad-gita, Srila Prabhupada explains that the king of knowledge is knowledge of God, his creation, and ourselves—and the relationships between these. He explains that the way to attain this knowledge is through bhakti-yoga, devotional service to the Lord, beginning with the chanting of the maha-mantra, Hare Krsna, Hare Krsna, Krsna Krsna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare.