The Bhagavad-gītā is spoken in the battlefield, and Arjuna was denying to fight, but Kṛṣṇa was asking him to fight. So the fighting was good, because it was the will of the Absolute Personality of Godhead. Therefore at the end of understanding Bhagavad-gītā, Arjuna agreed, "Yes, I shall fight."
So fighting for the matter of executing the desire of the Supreme Will is also absolute. It is not different from Absolute Truth. So sometimes it is . . . just like we sometimes see mock-fighting, because that fighting spirit is there. The father and son, the little son is fighting with the father. That is not fighting, but the mock fight. But the fighting spirit is there. You cannot deny it.
Similarly, the fighting spirit is there. Sometimes that is exhibited by the Supreme Personality of Godhead. And He wanted to exhibit such fighting spirit, so who will fight with Him? Ordinary living being cannot fight with the Supreme Lord. Therefore some of His devotees, some of His associates, must fight with Him.
Just like in the Bhagavad-gītā it is said that Arjuna was inquiring from Kṛṣṇa that, "You say that millions of years before, You spoke this Bhagavad-gītā yoga to the sun-god." Imaṁ vivasvate yogaṁ proktavān aham avyayam (BG 4.1). The Lord said that, "Many, many, many, many millions of years before, ago, I explained this science of Bhagavad-gītā to the sun-god." Now, to eliminate any doubts in the mind of ordinary persons like us, Arjuna inquired that, "Kṛṣṇa, You are my friend. We are almost of the same age. How do you say that You explained this Bhagavad-gītā millions and millions of years ago to the sun-god? How can I believe that?" In answer to this question, Kṛṣṇa said that "Both you . . ."
(break) ". . . descended on this material world many, many times, but you have forgotten; I remember." That is the nature of ordinary living entity. The nature is forgetfulness. But God does not forget. He knows past, present and future. That is the difference between Arjuna and Kṛṣṇa.
So the fighting spirit, it is to be understood. The fighting spirit is there in the Supreme Personality of Godhead, and it is exhibited at a certain period just to teach us . . . (indistinct) . . . when fighting should be taken. Fighting is not very good thing, but if there is necessity . . . just like in the Battlefield of Kurukṣetra. The Battlefield of Kurukṣetra was organized by two rival parties. One party was pious; another party was impious. So Kṛṣṇa took side of Arjuna, and he was victorious. That is the history of Kurukṣetra fight.
So the Lord wanted to exhibit His fighting spirit. And who will fight with Him? Therefore two of His devotees were resigned that they should go in the material world and fight with the Supreme Personality of Godhead. Because in the Vaikuṇṭha world there is no question of fighting. There is no enmity. Everyone accepts the Supreme Personality of Godhead as the protector, as the master, as the Lord, and they serve faithfully. So there is no question of fighting.
In the material world everyone wants to be the lord, everyone wants to be God, so therefore there is fight. The fighting here takes place because everyone wants to lord it over the material nature, so there is difference of interest. I want to be lord, you want to be lord: now there must be fight. But in the Vaikuṇṭha world there is one Lord and all others servitor. Therefore there is peace.