The purpose of Adhyay 10- Bhagavad Gita
bhuya eva maha-baho
srnu me paramam vacah
yat te ‘ham priyamanaya
While Krsna was present on this earth, He displayed all six opulences. Therefore great sages like Parasara Muni have all accepted Krsna as the Supreme Personality of Godhead. Now Krsna is instructing Arjuna in the more confidential knowledge of His opulences and His work. Previously, beginning with the Seventh Chapter, the Lord already explained His different energies and how they are acting. Now in this chapter, He explains His specific opulences to Arjuna.
In the previous chapter he has clearly explained His different energies to establish devotion in firm conviction. Again in this chapter He tells Arjuna about His manifestations and various opulences.
The more one hears about the Supreme God, the more one becomes fixed in devotional service. One should always hear about the Lord in the association of devotees; that will enhance one’s devotional service. Discourses in the society of devotees can take place only among those who are really anxious to be in Krsna consciousness. Others cannot take part in such discourses.
The Lord clearly tells Arjuna that because he is very dear to Him, for his benefit such discourses are taking place.