SB 11.19 Summary
A.C. Bhaktivedanta Swami Prabhupada
This chapter describes how those who practice speculative knowledge eventually give up their method, whereas the pure devotees remain engaged in devotional service eternally. Also described are the different practices of the yogīs, beginning with yama.
The Supreme Lord, Śrī Kṛṣṇa, stated to Uddhava, "One who is actually wise, who knows the truth of the self and possesses transcendental insight, rejects this world of dualities and the so-called knowledge meant for facilitating enjoyment of it. He instead engages himself in trying to satisfy the Supreme Personality of Godhead, the master of all. This is pure bhakti-yoga. Transcendental knowledge is greater than such ordinary pious activities as chanting of mantras, but pure devotional service is greater than even knowledge."
After this, Lord Kṛṣṇa, requested by Śrī Uddhava to describe in full detail pure transcendental knowledge and devotional service, related the same instructions that the greatest of Vaiṣṇavas, Bhīṣmadeva, gave on these topics to Śrī Yudhiṣṭhira on the occasion of the battle at Kurukṣetra. Following this, after being asked about yama and the other practices of yoga, the Lord enumerated the twelve kinds of yama beginning with nonviolence, and the twelve kinds of niyama, beginning with bodily cleanliness.