Sankaracarya's theory is that you first of all become a sannyasa, in renounced order of life; then you try to understand what you are, sankhya philosophy. Therefore, according to their system, anyone who takes sannyasa, he's supposed to be immediately merged into the existence of God. Therefore they address, "Narayana." In Sankara sampradaya, one sannyasi addresses another sannyasi as "Naryana." But here, in Krsna consciousness movement, there is no condition. The only condition is... That is not condition; that is recreation.
Lecture on Bhagavad-gita 3.1-5, Los Angeles, December 20, 1968