Tensions are our guests; we have invited them. Relaxation is our nature; we don’t have to invite it. You don’t have to relax; you have just to stop inviting tensions, and relaxation will start on its own accord. In your very being, in every fibre, in every cell of your being there will be relaxation. This relaxation is the beginning of meditation.
-Osho
One really doesn’t have to be a scientist or a researcher to know the effects of anger on one’s health. One has only to be sensitive. The being of an angry person starts transmitting vibrations of anger and violence around him. Just standing close to such a person may make you feel nauseated. His very presence in the proximity can be uncomfortable. On the other hand, when you stand close to someone who meditates, you will feel uplifted, a feeling of comfort surrounds you.
-Swami Chaitanya Keerti

Cast off anger from your heart, like an arrow from the bow, so that you may again be friends and live together in harmony.
-Atharva Veda 

Sister Elizabeth Kenny, the renowned Irish-Australian nurse, was once asked by a friend how she managed to stay constantly cheerful. 
Sister Kenny replied: “As a girl I would often lose my temper. But one day when I became angry with a friend over a trivial matter, my mother gave me sound advice that I remember always. She said that anyone who angers you conquers you.”
-Anonymous

Anger is only one letter short of danger.
-Anonymous