The instruction of this narration concerning the churning of the Milk Ocean is clearly manifested by the Supreme Personality of Godhead. Although He is equal to everyone, because of natural affection He favors His devotees. The Lord says in Bhagavad-gītā (9.29) :

samo ’haṁ sarva-bhūteṣu na me dveṣyo ’sti na priyaḥ ye bhajanti tu māṁ bhaktyā mayi te teṣu cāpy aham

“I envy no one, nor am I partial to anyone. I am equal to all. But whoever renders service unto Me in devotion is a friend, is in Me, and I am also a friend to him.” This partiality of the Supreme Personality of Godhead is natural. A person cares for his children not because of partiality but in a reciprocation of love. The children depend on the father’s affection, and the father affectionately maintains the children. Similarly, because devotees do not know anything but the lotus feet of the Lord, the Lord is always prepared to give protection to His devotees and fulfill their desires. He therefore says, kaunteya pratijānīhi na me bhaktaḥ praṇaśyati: “O son of Kuntī, declare it boldly that My devotee never perishes.”

Thus end the Bhaktivedanta purports of the Eighth Canto, Twelfth Chapter, of the Śrīmad-Bhāgavatam, entitled “The Mohinī-mūrti Incarnation Bewilders Lord Śiva.”