Dzongsar Khyentse Rinpoche:
Trying to change the outerworld to pursuit of perfection is futile. There is always something unexpected happens, make you angry without knowing and prepared. How much you are grasping, how much pain you will have. In order to get rid of pain and suffering, you must be away from all attachment. When you were angry, you should look at your own mind, why being so angry? Is it because things happened against your wish and expectation? Your expectations, is the thing you are grasping.