Srimad Bhagavatam Canto 4 Chapter 8 Text 58

Canto 4 Chapter 8 Text 58

paricaryā bhagavato
yāvatyaḥ pūrva-sevitāḥ
tā mantra-hṛdayenaiva
prayuñjyān mantra-mūrtaye

TRANSLATION
One should follow in the footsteps of previous devotees regarding how to worship the Supreme Lord with the prescribed paraphernalia, or one should offer worship within the heart by reciting the mantra to the Personality of Godhead, who is nondifferent from the mantra.