Although Krsna is manifested before Arjuna in His universal form, Arjuna remembers his friendly relationship with Krsna and is therefore asking pardon and requesting Him to excuse him for the many informal gestures which arise out of friendship. He is admitting that formerly he did not know that Krsna could assume such a universal form, although He explained it as his intimate friend. Arjuna did not know how many times he may have dishonored Him by addressing Him as "O my friend, O Krsna, O Yadava," etc., without acknowledging His opulence. But Krsna is so kind and merciful that in spite of such opulence He played with Arjuna as a friend. Such is the transcendental loving reciprocation between the devotee and the Lord. The relationship between the living entity and Krsna is fixed eternally; it cannot be forgotten, as we can see from the behavior of Arjuna. Although Arjuna has seen the opulence in the universal form, he could not forget his friendly relationship with Krsna.