rajas-tamaḥ-svabhāvasya
brahman vṛtrasya pāpmanaḥ
nārāyaṇe bhagavati
katham āsīd dṛḍhā matiḥ
śrī-parīkṣit uvāca-King Parīkṣit inquired; rajaḥ-of the mode of passion; tamaḥ-and of the mode of ignorance; sva-bhāvasya-having a nature; brahman-O learned brāhmaṇa; vṛtrasya-of Vṛtrāsura; pāpmanaḥ-who was supposedly sinful; nārāyaṇe-in Lord Nārāyaṇa; bhagavati-the Supreme Personality of Godhead; katham-how; āsīt-was there; dṛḍhā-very strong; matiḥ-consciousness.
King Parīkṣit inquired from Śukadeva Gosvāmī: O learned brāhmaṇa, demons are generally sinful, being obsessed with the modes of passion and ignorance. How, then, could Vṛtrāsura have attained such exalted love for the Supreme Personality of Godhead, Nārāyaṇa?
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):