This is the story taken form one of the famous book of Hindus name as Mahabharata. In this video there is a story from this scripture where after defeating and behading Karna one of the warrior from Kauravas side Arjuna Started to boost about his Power in front Lord Krishna. Whereas Lord Krishna opens the eyes of Arjuna and introduce him to the real reason why he was able to defeat Karna with such an ease.