brahman vṛtrasya pāpmanaḥ
katham āsīd dṛḍhā matiḥ
In this material world, everyone is obsessed with the modes of passion and ignorance. However, unless one conquers these modes and comes to the platform of goodness, there is no chance of one’s becoming a pure devotee. This is confirmed by Lord Kṛṣṇa Himself in Bhagavad-gītā (7.28):
yeṣāṁ tv anta-gataṁ pāpaṁ
bhajante māṁ dṛḍha-vratāḥ
“Persons who have acted piously in previous lives and in this life, whose sinful actions are completely eradicated and who are freed from the duality of delusion, engage themselves in My service with determination.” Since Vṛtrāsura was among the demons, Mahārāja Parīkṣit wondered how it was possible for him to have become such an exalted devotee.