It demonstrates the idea of fulfilling your destiny, and following your dharma. Arjun makes the decision to fight and thus completes his duties, virtues and destiny. This is framed as the right decision, doing what you are supposed to do.
According to the epic tradition in the Mahabharata, Arjuna was reluctant to fight against the Kuru Kingdom becuase he knew he would produce many casualties in the enemy. He knew that in the enemy lines were several memebers of his own family, therefore, he had to be convinced by Krishna.
The conversation between Krishna and Arjuna, was about courage, the duty of the warrior and human nature. This specific dialogue is a keypoint in Mahabharata and it is considered a classic text of Hinduism. According to Hinduism, Dharma is a concept that describes the laws, behaviors and acts that every single human should follow to be in harmony with the cosmos. The keypoints of Dharma are surveyed briefly during the conversation between Krishna and Arjuna and for that reason , his decision to fight sumarizes the guidelines of Dharma to be a good warrior and prince.
