devānām - of the demigods; śuddha-sattvānām - whose minds are purified; ṛṣīṇām - of great saintly persons; ca - and; amala-ātmanām - who have purified their existence; bhaktiḥ - devotional service; mukunda-caraṇe - to the lotus feet of Mukunda, the Lord, who can give liberation; na - not; prāyeṇa - almost always; upajāyate - develops.

Demigods situated in the mode of goodness and great saints cleansed of the dirt of material enjoyment hardly ever render pure devotional service at the lotus feet of Mukunda. [Therefore how could Vṛtrāsura have become such a great devotee?]