A class on Srimad Bhagavatam 1.2.7 given by His Divine Grace A.C. Bhaktivedanta Swami Prabhupada on October 18, 1972 in Vrindavan, India.
A transcript of the class can be found here: https://goo.gl/kq6NY7.
Srimad Bhagavatam 1.2.7
vāsudeve bhagavati
bhakti-yogaḥ prayojitaḥ
janayaty āśu vairāgyaṁ
jñānaṁ ca yad ahaitukam
By rendering devotional service unto the Personality of Godhead, Śrī Kṛṣṇa, one immediately acquires causeless knowledge and detachment from the world.