1. Grievances are negative emotions, resentments, and complaints we hold against others. They are detrimental to our peace of mind.
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.
2. Letting go of grievances and practicing forgiveness is essential for inner peace and spiritual awakening.
3. So, "You don't bring sand to a beach" serves as a reminder to release grievances rather than perpetuate them in a world already filled with conflict and discord.