If there is a worst enemy of human being or any living being ever exists, then it is well within ourselves. We never realize that stress that we built inside us, take the form of anger and Jealousy untill it is too late.
You can beat any enemy ever seen or possible have physique but the one which is hidden and behind every violence live well within us and we often spend whole life time without knowing the fact that Anger should be conquered first and then we can live a peaceful life.
If you wont able to get rid of your Anger & intolerance, then you start feeling annoyed with every relationship as time went by.
God once said," If human being never manage to become tolerant, then even after couple of weeks of God's company would start feeling irritative.
Question arise that Anger could be the outcome of living the life you never dream if or never get what you deserve but when these aspirations take the form of Anger, we might never get an idea.
Living a peaceful life requires control of mind and thoughts and bring a stillness in our life and that is what we usually never try out.
For me, Anger is like holding a hot coal with an intention to throw it away to someone else and we all know who will get burnt first.