Only a rare person who has adopted complete, unalloyed devotional service to Kṛṣṇa can uproot the weeds of sinful actions with no possibility that they will revive. He can do this simply by discharging devotional service, just as the sun can immediately dissipate fog by its rays.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
केचित्केवलया भक्त्या वासुदेवपरायणाः । अघं धुन्वन्ति कार्त्स्न्येन नीहारमिव भास्करः
kecitkevalayā bhaktyā vāsudevaparāyaṇāḥ | aghaṃ dhunvanti kārtsnyena nīhāramiva bhāskaraḥ
SB 6.1.15