Holding on to anger is like grasping a hot coal with the intent of throwing it at someone else; you are the one who gets burned.
We are shaped by our thoughts; we become what we think. When the mind is pure, joy follows like a shadow that never leaves.
However many holy words you read, however many you speak, what good will they do you if you do not act on upon them?
There are only two mistakes one can make along the road to truth; not going all the way, and not starting.