Devotee: Rupa and Sanatan Goswami, did they have any mantra shishyas? Wasn't Jiva Goswami a mantra shishya of Rupa Goswami?
Sridhara Maharaja: Yes, and Rupa Goswami was the mantrashishya of Sanatan, Sanatan Goswami was the mantra shishya of Vidya Vacaspati. Vidya Vacaspati's brother was Sarvabhauma, a mayavadi. That is formal (diksa).
Devotee: Was that actually diksa or siksa? Between Rupa and Sanatan; they got mantram?
Sridhara Maharaja: They got mantram from their guru-- mantram. But what mantram? Mahaprabhu Himself got mantram, but according to His order, Sanatan Goswami has selected another mantram for the Gaudiya Vaisnavas. Mahaprabhu got the dvadasha mantram [ 12 syllables] from Ishvara Puri, but when ordered by Mahaprabhu to consult the the Vaisnava sastras and try to preach what the real conduct of a Vaisnava should be. "And I bless you that Krishna will guide you to compile a Vaisnava sruti and Sanatan Goswami did that accordingly, and he has collected the astadasakara mantra [eighteen syllable mantra: kleeng krishnaya govindaya gopijanaballavaya swaha] for us, and that is now in use. It is continuing in the sampradaya, and not the mantra that Mahaprabhu received from Ishvara Puri. But by the order of Mahaprabhu, this mantram came through Sanatan Goswami, this mantram came, astadasakara, and that is continuing and someone also amongst the Goswamis, they go on with that dvadashaksara mantra of Mahaprabhu.