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-gita

Expressions researched:
"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"

Srimad-Bhagavatam

SB Canto 6

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.

SB 6.17.38, Translation and Purport

Being cursed by mother Durgā [Bhavānī, the wife of Lord Śiva], that same Citraketu accepted birth in a demoniac species of life. Although still fully equipped with transcendental knowledge and practical application of that knowledge in life, he appeared as a demon at the fire sacrifice performed by Tvaṣṭā, and thus he became famous as Vṛtrāsura

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.