There is no such thing as a gathering that never ends. It means that reunion is relative and separation will eventually occur. Same as "There is no banquet in the world that never comes to an end".

Source: Volume 35 of "Awakening Words of the World" by Feng Menglong of the Ming Dynasty: "There is no banquet in the world that cannot be separated for a thousand years, and there must be a day of separation.

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