Can you please quote the scriptural reference of this story? Lessons apart but this look like a made up story to favour Karna over Arjuna. Karna the person who call out to disrobe a woman, by cheating achieved martial skills how can he be on the path on enlightenment? Also, Bhagavad Gita the most confidential knowledge was not spoken to Karna but Arjuna who was the epitome of pure life.