236
Śrīmad-Bhāgavatam
[Canto 6, Ch. 12]
daiva āsuras tad-viparyayaḥ.  Vṛtrāsura was considered a demon, but actually he was more than qualified as a devotee, or  mahā-pauruṣya . If one somehow becomes a devotee of the Supreme Lord, whatever his position, he can be brought to the position of a perfect person. This is possible if an unalloyed devotee tries to serve the Lord by delivering him in this way. Therefore Śukadeva Gosvāmī says in  Śrīmad-Bhāgavatam  (2.4.18):
kirāta-hūṇāndhra-pulinda-pulkaśā ābhīra-śumbhā yavanāḥ khasādayaḥ ye 'nye ca pāpā yad-apāśrayāśrayāḥ śudhyanti tasmai prabhaviṣṇave namaḥ
“Kirātas, Hūṇas, Āndhras, Pulindas, Pulkaśas, Ābhīras, Śumbhas, Yavanas and members of the Khasa races, and even others addicted to sinful acts can be purified by taking shelter of the devotees of the Lord, for He is the supreme power. I beg to offer my respectful obeisances unto Him.” Anyone can be purified if he takes shelter of a pure devotee and molds his character according to the pure devotee’s direction. Then, even if one is a Kirāta, Āndhra, Pulinda or whatever, he can be purified and elevated to the position of a  mahā-pauruṣya .
TEXT 21
खल्विदं महदाश्वर्यं यद् रजःप्रकृतेस्तव । वासुदेवे भगवति सच्चात्मनि दृढा मतिः ॥२१॥
khalv idam mahad āścaryam yad rajaḥ-prakṛtes tava vāsudeve bhagavati sattvātmani dṛḍhā matiḥ
khalu—indeed; idam—this; mahat āścaryam—great wonder; yat—which; rajaḥ—influenced by the mode of passion; prakṛteḥ—whose nature; tava—of you; vāsudeve—in Lord Kṛṣṇa; bhagavati—the Supreme Personality of Godhead; sattva-ātmani—who is situated in pure goodness; dṛḍhā—firm; matiḥ—consciousness.