Prabhupāda: "Humility, pridelessness, nonviolence, tolerance, simplicity, approaching a bona fide spiritual master, cleanliness, steadiness and self-control; renunciation of the objects of sense gratification, absence of false ego, the perception of the evil of birth, death, old age and disease; nonattachment to children, wife, home and the rest, and evenmindedness amid pleasant and unpleasant events; constant and unalloyed devotion to Me, resorting to solitary places, detachment from the general mass of people; accepting the importance of self-realization, and philosophical search for the Absolute Truth-all these I thus declare to be knowledge, and what is contrary to these is ignorance."
Prabhupāda: There are eighteen chapters in the Bhagavad Gita, of which six chapters are on karma-yoga, six chapters on bhakti-yoga and six chapters on jnana-yoga. This Thirteenth chapter is on jnana-yoga. Bhagavad Gita has karma, jnana and bhakti. Pure devotion has no connection with jnana and karma. The Lord has spoken about bhakti-yoga in the middle. Just like there is a book, it has covers on both sides and in the middle there is substance. Similarly the Lord speaks on side the karma-yoga and the other side the bhakti-yoga. Just like the book has a covering, but the real substance, bhakti-yoga begins from chapter seven to chapter twelve.