It is good you have a heart. It is good when your heart is centered, when your heart is strong unto itself. It is good when you are content. You would like to be content all the time, and, yet, you sometimes find yourself discontent, perhaps angry, and, perhaps, in terms of the world, rightly so.
It is good to not let your anger run wild. At the same time, anger is a force that it is better to acknowledge than not to acknowledge. Repressing anger is not good for you. There is a cause for your anger, and it seems righteous to you. It may seem righteous to the whole world, and yet anger is anger, and anger repressed is like a pot of boiling water left simmering on the stove. The water is still hot. The water foments. You don’t want to lash out in anger, and you don’t want to push anger back as if it doesn’t exist.