The man who gives way to anger, or hatred, or any other passion, cannot work; he only breaks himself to pieces, and does nothing practical. It is the calm, forgiving, equable, well-balanced mind that does the greatest amount of work.
If we ourselves remain angry and then sing world peace, it has little meaning. First, our individual self must learn peace.
This we can practice. Then we can teach the rest of the world.
Let us work without desire for name or fame or rule over others. Let us be free from the triple bonds of lust, greed of gain, and anger. And this truth is with us!
If there be devils, would I were a devil, To live and burn in everlasting fire, So I might have your company in hell, But to torment you with my bitter tongue!
Evil company is always to be shunned; because it leads to lust and anger, illusion, forgetfulness of the goal, destruction of the will (lack of perseverance), and destruction of everything. (Narada Bhakti Sutra)