A class on Srimad Bhagavatam 1.2.34 given by His Divine Grace A.C. Bhaktivedanta Swami Prabhupada on November 13, 1972 in Vrindavan, India.
A transcript of the class can be found here: https://goo.gl/tkymt9.
Srimad Bhagavatam 1.2.34
bhāvayaty eṣa sattvena
lokān vai loka-bhāvanaḥ
līlāvatārānurato
deva-tiryaṅ-narādiṣu
Thus the Lord of the universes maintains all planets inhabited by demigods, men and lower animals. Assuming the roles of incarnations, He performs pastimes to reclaim those in the mode of pure goodness.
