And for that, Arjun would be receiving a prize. The prize was that Dronacharya would teach Arjun hoe to use Brahmastra.
"You mean how to use Brahmastras?" asked Bheem in clarification
Karna said that he had not fled or frozen up. He had readied his bow and arrows too. Arjun just beat him by a second. Dronacharya calls Karan into private.
dronacharya :-Son, you did not leave because of your love but you were distracted in thinking and hence you remained behind Arjun. Son, I cannot impart the knowledge of Brahmastra to you because your childhood was full of pain, staying inside the house during the rainy season, the armour and earrings used to protect you but it was the same that took away your childhood.
Karan:- Gurudev your opinion is correct, but listen to me I am full of pain but this pain itself makes me different from other people in knowledge and subtle arts, this pain gives me the knowledge of right and wrong.
Dronacharya:-Karan your words are correct in their place, but I cannot ignore Gurudev Parshuram, he had said that I cannot give the knowledge of Bhramaastra to the greedy, ambitious, greedy, lustful and pained.
Karan:-I will take knowledge from those who are unfit to know Brahmastra without knowing me or without knowing from me.