By one’s engaging in the processes of demigod worship, austerities, breath control, compassion, bathing in holy places, strict vows, charity and chanting of various mantras, one’s mind cannot attain the same absolute purification as that achieved when the unlimited Personality of Godhead appears within one’s heart.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
विद्यातपःप्राणनिरोधमैत्री तीर्थाभिषेकव्रतदानजप्यैः । नात्यन्तशुद्धिं लभतेऽन्तरात्मा यथा हृदिस्थे भगवत्यनन्ते
vidyātapaḥprāṇanirodhamaitrī tīrthābhiṣekavratadānajapyaiḥ | nātyantaśuddhiṃ labhate'ntarātmā yathā hṛdisthe bhagavatyanante
SB 12.3.48