Excerpt from a less-bluepilled translation of Baghavad Gita, where Arjuna is about to fight people from his own tribe:
Sanjaya said: Seeing Arjuna full of compassion, his mind depressed, his eyes full of tears, Madhusudana, Krsna, spoke the following words.
The Supreme Personality of Godhead said: My dear Arjuna, how have these impurities come upon you? They are not at all befitting a man who knows the value of life. They lead not to higher planets but to infamy.
O son of Prtha, do not yield to this degrading impotence. It does not become you. Give up such petty weakness of heart and arise, o chastiser of the enemy.
Arjuna said: O killer of enemies, O killer of Madhu, how can I counterattack with arrows in battle men like Bhisma and Drona, who are worthy of my worship?
It would be better to live in this world by begging than to live at the cost of the lives of great souls who are my teachers. Even though desiring worldly gain, they are superiors. If they are killed, everything we enjoy will be tainted with blood.
Nor do we know which is better - conquering them or being conquered by them. If we killed the sons of Dhrtarastra, we should not care to live. Yet they are now standing before us on the battlefield.
Now I am confused about my duty and have lost all composure because of miserly weakness. In this condition I am asking You to tell me for certain what is best for me. Now I am Your disciple, and a soul surrendered unto You. Please instruct me.
I can find no means to drive away this grief which is drying up my senses. I will not be able to dispel it even if I win a prosperous, unrivaled kingdom on earth with sovereignty like the demigods in heaven.
Sanjaya said: Having spoken thus, Arjuna, chastiser of enemies, told Krsna "Govinda, I shall not fight," and fell silent.
O descendant of Bharata, at that time Krsna, smiling, in the midst of both armies, spoke the following words to the grief-stricken Arjuna.
The Supreme Personality of Godhead said: While speaking learned words, you are mourning for what is not worthy of grief. Those who are wise lament neither for the living nor for the dead.
Never was there a time when I did not exist, nor you, nor all these kings; nor in the future shall of us cease to be.
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O best among men [Arjuna], the person who is not disturbed by happiness and distress and is steady in both is certainly eligible for liberation.
Those who are seers of the truth have concluded that of the nonexistent [the material body] there is no endurance and of the eternal [the soul] there is no change. This they have concluded by studying the nature of both.
That which pervades the entire body you should know to be indestructible. No one is able to destroy that imperishable soul.
The material body of the indestructible, immeasurable and eternal living entity is sure to come to an end; therefor, fight, O descendant of Bharata.
Neither he who thinks the living entity the slayer nor he who thinks it slain is in knowledge, for the self slays not nor is slain.
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O descendant of Bharata, he who dwells in the body can never be slain. Therefor you need not grieve for any living being.
Considering your specific duty as a ksatriya, you should know that there is no better engagement for you than fighting on religious principles; and so there is no need for hesitation.
O Partha, happy are the ksatriyas to whom such fighting opportunities come unsought, opening for them the doors of the heavenly planets.
If, however, you do not perform your religious duty of fighting, then you will certainly incur sins for neglecting your duties and thus lose your reputation as a fighter.
People will always speak of your infamy, and for a respectable person, dishonor is worse than death.
The great generals who have highly esteemed your name and fame will think that you have left the battlefield out of fear only, and thus they will consider you insignificant.
Your enemies will describe you in many unkind words and scorn your ability. What could be more painful for you?
O son of Kunti, either you will be killed on the battlefield and attain the heavenly planets, or you will conquer and enjoy the earthly kingdom. Therefore, get up and with determination and fight.