Sri Caitanya Mahaprabhu asked, “Among all worshipable objects, which is the chief?”

Ramananda Raya replied, “The chief worshipable object is the holy name of Radha and Krsna, the Hare Krsna mantra.”

Srila Prabhupada’s translation of Sri Caitanya-caritamrta Madhya-lila 8.256