There is no such thing as an experienced meditator. Every breath must be as if it is the first, every step a fresh event. A beginner's mind leads to a sense of gratitude for everything, whether or not the desires of my ego have been granted or life is going smoothly. A grateful heart for the rushing currents as well as for the still pools puts the ego in its place. This attitude that grows out of increased awareness does not come easily in the face of difficulties, but it is worth cultivating over a lifetime.
Anger destroys all ability to be at peace with yourself and with others. If you harm me, it is you who lose: you lose your peace.