VERSE

By the mercy of Vyasa, I have heard these most confidential talks directly from the master of all mysticism, Krsna, who was speaking personally to Arjuna.


PURPORT

Vyasa was the spiritual master of Sanjaya, and Sanjaya admits that it was by Vyasa's mercy that he could understand the Supreme Personality of Godhead. This means that one has to understand Krsna not directly but through the medium of the spiritual master. The spiritual master is the transparent medium, although it is true that the experience is still direct. This is the mystery of the disciplic succession. When the spiritual master is bona fide, then one can hear Bhagavad-gita directly, as Arjuna heard it…

Narada is the direct disciple of Krsna and the spiritual master of Vyasa. Therefore Vyasa is as bona fide as Arjuna because he comes in the disciplic succession, and Sanjaya is the direct disciple of Vyasa. Therefore by the grace of Vyasa, Sanjaya's senses were purified, and he could see and hear Krsna directly. One who directly hears Krsna can understand this confidential knowledge. If one does not come to the disciplic succession, he cannot hear Krsna; therefore his knowledge is always imperfect, at least as far as understanding Bhagavad-gita is concerned...

It is to be understood, however, that as Arjuna was fortunate enough to understand Krsna directly, so, by the grace of Vyasa, Sanjaya was also able to hear Krsna directly. Actually there is no difference between hearing directly from Krsna and hearing directly from Krsna via a bona fide spiritual master like Vyasa. The spiritual master is the representative of Vyasadeva also. Therefore, according to the Vedic system, on the birthday of the spiritual master the disciples conduct the ceremony called Vyasa-puja.  [Bhagavad-gita 18.76]