TRANSLATION

O best of the Bharatas, see here the different manifestations of Adityas, Rudras, and all the demigods. Behold the many things which no one has ever seen or heard before.

Even though Arjuna was a personal friend of Krsna and the most advanced of learned men, it was still not possible for him to know everything about Krsna. Here it is stated that humans have neither heard nor known of all these forms and manifestations. Now Krsna reveals these wonderful forms.