1. Grievances are negative emotions, resentments, and complaints we hold against others. They are detrimental to our peace of mind.

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The metaphor implies that bringing grievances (represented by "sand") to a situation where they are already abundant (the "beach") is unnecessary and counterproductive.

In other words, holding onto grievances in a world where conflicts and grievances are already prevalent only adds to the existing negativity and does not bring resolution of issues.