Never do a single thing in the anticipation to prove something to someone who has hurt you. If someone has hurt or offended you (whoever that person may be), never perform anything or strive for anything in your life with the mind of proving something to that someone/ to those people. May nothing that you do be done with any thought of them in mind. There is nothing that needs to be proven.
I am a man that knows of the possibility of failure. I have suffered defeat. I have created miscalculations. I have even abandoned victory, and fallen in shame. I can claim my arrogance. I can claim my ignorance. I can claim my naiveté. However, the creation of those possibilities were simply due to a lack of understanding of who I was. I have conquered my Id. I have conquered my Ego. I have conquered my Spirituality. I am a man that knows of the possibility of failure, but because I have mastered the principles of nothing, possibility, and uncertainty, failure simply tags along with me, unable to grasp my glory.