A time of Ibn 'Umar asked the Prophet Muhammad, "what can keep me from the wrath of Allah Almighty?" The apostle immediately replied "do not be angry!"
Other times, the Prophet Muhammad to repeat three times in his saying, when one friend asked for advice to him, "do not be angry!"

Anger is a flame from hell. Someone angry at having close links with the inhabitants of the absolute life of hell, that is the devil when saying yes, "I am better than him (Adam), You created me from fire and him You created from the earth" (Surah Al_A'raf: 12)
Disposition of land is quiet and calm, while the nature of fire is a turbulent, burning, moving, and shaking.

If someone was angry but could not acted, then the blood it will draw didri from the outside of the skin into the cavity of the heart, so he turned into sadness, because usually the color is too yellow and changed the face of glum.

Humans have four types of anger: The first quick-tempered, quickly realized (this is bad), the slow anger, slow to realize (this is less commendable), the three quick-tempered, slow to realize (the worst nature), and four slow angry, quickly realized (this the best).

People who slow angry but soon realized was an admirable figure of believers. Because he was trying to absorb and manage it properly, so the short end of the anger that was there to remind and learning process.