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.
We always think our negative emotions are produced by the fault of other people or by the fault of circumstances. We always think that. Our negative emotions are in ourselves and are produced by ourselves. There is absolutely not a single unavoidable reason why somebody else's action or some circumstance should produce a negative emotion in me. It is only my weakness. No negative emotion can be produced by external causes if we do not want it. We have negative emotions because we permit them, justify them, explain them by external causes, and in this way we do not struggle with them.