CC Ādi 6.30
dui-nāma-milane haila ‘advaita-ācārya’
He is the spiritual master of all devotees and is the most revered personality in the world. By a combination of these two names, His name is Advaita Ācārya.
Śrī Advaita Ācārya is the prime spiritual master of the Vaiṣṇavas, and He is worshipable by all Vaiṣṇavas. Vaiṣṇavas must follow in the footsteps of Advaita Ācārya, for by so doing one can actually engage in the devotional service of the Lord.