SB 12.3.48
vidya-tapah-prana-nirodha-maitri-
tirthabhiseka-vrata-dana-japyaih
natyanta-suddhim labhate ’ntaratma
yatha hrdi-sthe bhagavaty anante
Translation:
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.