You are the cause of your own joy or your own misery. You hold that power. You are your own friend and your own enemy.
Our own true nature is Infinite Joy! Always happy, Always peaceful, Always free.
When you win and the other fellow loses, what do you see? A losing face. There is great joy in losing and making the other person win and have a happy face. Who will be the happiest person? The one who brings happiness to others.