ei saba na mane yeba kare krsna-bhakti
krsna-krpa nahi tare, nahi tara gati
ei—these; saba—all; na mane—does not accept; yeba—anyone who; kare—executes; krsna-bhakti—devotional service; krsna-krpa—mercy of Krsna; nahi—is not; tare—unto him; nahi—there is not; tara—his; gati—advancement.
One who does not accept the glories of the Panca-tattva but still makes a show of devotional service to Krsna can never achieve the mercy of Krsna or advance to the ultimate goal.
If one is seriously interested in Krsna conscious activities, he must be ready to follow the rules and regulations laid down by the acaryas, and he must understand their conclusions. The sastra says: dharmasya tattvam nihitam guhayam maha-jano yena gatah sa panthah (Mahabharata, Vana-parva 313.117). It is very difficult to understand the secret of Krsna consciousness, but one who advances by the instruction of the previous acaryas and follows in the footsteps of his predecessors in the line of disciplic succession will have success. Others will not. Srila Narottama dasa Thakura says in this connection, chadiya vaisnava-seva nistara payeche keba: "Unless one serves the spiritual master and acaryas, one cannot be liberated." Elsewhere he says:
ei chaya gosani yara--mui tara dasa
tan' sabara pada-renu mora panca-grasa
"I simply accept a person who follows in the footsteps of the six Gosvamis, and the dust of such a person's lotus feet is my food."
Link to this page: http://prabhupadabooks.com/cc/adi/8/7