One get very angry against someone and slap them. But think for a moment; it is a great sin to hurt others. In the process, you are hurting not your enemy but God, verily! All are divine. Hence, never hurt anyone. It is natural to help those who help you, but you should be able to help even those who harm you. There is nothing great in helping those who have helped you. The noble ones are those who help even those who have harmed them.
We must always be calm, serene, and peaceful under all circumstances. If only you maintain the quality of peace, you can achieve anything in life. Wherever you see in the outside world, it is only pieces and pieces! Do not hurt the feelings of others, come what may.