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Śrīmad-Bhāgavatam
[Canto 6, Ch. 17]
yatra kva vābhadram abhūd amuṣya kiṁ ko vārtha āpto 'bhajatāṁ sva-dharmataḥ (Bhāg. 1.5.17)
Once one is advanced in devotional service, his spiritual assets are never lost under any circumstances. Whatever spiritual advancement he has achieved continues. This is confirmed in  Bhagavad-gītā . Even if a  bhakti-yogī  falls, he takes birth in a rich family or family of  brāhmaṇas , in which he again starts devotional activities from the point where he left off. Although Vṛtrāsura was known as an  asura , or demon, he did not lose his consciousness of Kṛṣṇa or devotional service.
TEXT 39
एतत्ते सर्वमाख्यातं यन्मां त्वं परिपृच्छसि । वृत्रस्यासुरजातेश्च कारणं भगवन्मतेः ॥३९॥
etat te sarvam ākhyātaṁ yan māṁ tvaṁ paripṛcchasi vṛtrasyāsura-jāteś ca kāraṇaṁ bhagavan-mateḥ
etat—this; te—unto you; sarvam—all; ākhyātam—explained; yat—which; mām—me; tvam—you; paripṛcchasi—asked; vṛtrasya—of Vṛtrāsura; asura-jāteḥ—whose birth was in a species of asuras; ca—and; kāraṇam—the cause; bhagavat-mateḥ—of exalted intelligence in Kṛṣṇa consciousness.
TRANSLATION
My dear King Parikṣit, you inquired from me how Vṛtrāsura, a great devotee, took birth in a demoniac family. Thus I have tried to explain to you everything about this.
TEXT 40
इतिहासमिमं पुण्यं चित्रकेतोर्महात्मनः । माहात्म्यं विष्णुभक्तानां श्रुत्वा बन्धाद्विमुच्यते ॥४०॥