One verse

Srimad Bhagavatam 12.3.48

12.3.48

विद्यातप:प्राणनिरोधमैत्री- तीर्थाभिषेकव्रतदानजप्यै: । नात्यन्तशुद्धिं लभतेऽन्तरात्मा यथा हृदिस्थे भगवत्यनन्ते ॥ ४८ ॥

vidyā-tapaḥ-prāṇa-nirodha-maitrī- tīrthābhiṣeka-vrata-dāna-japyaiḥ nātyanta-śuddhiṁ labhate ’ntarātmā yathā hṛdi-sthe bhagavaty anante

vidyā
by worship of demigods
tapaḥ
austerities
prāṇa-nirodha
exercise of breath control
maitrī
compassion
tīrtha-abhiṣeka
bathing in holy places
vrata
strict vows
dāna
charity
japyaiḥ
and chanting of various mantras
na
not
atyanta
complete
śuddhim
purification
labhate
can achieve
antaḥ-ātmā
the mind
yathā
as
hṛdi-sthe
when He is present within the heart
bhagavati
the Personality of Godhead
anante
the unlimited Lord

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.