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.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
भावयत्येष सत्त्वेन लोकान् वै लोकभावनः । लीलावतारानुरतो देवतिर्यङ्नरादिषु
bhāvayatyeṣa sattvena lokān vai lokabhāvanaḥ | līlāvatārānurato devatiryaṅnarādiṣu
SB 1.2.34