Bhagavad Gita Chapter 11
Conclusion:
here is no greater sin than carrying such guilt. What we did was not sinful; to carry the guilt with us is sinful. Arjuna is demonstrating to the rest of us the power of guilt; in this case, guilt that seems to arise from the deepest of love. In one sense he does not wish to carry that guilt with him. He drops it in front of his friend, Lord and master saying, 'Forgive me.'