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不來不去 is a Buddhist term, originally anāgamana-nirgama from Sanskrit.
This implies that things are neither coming into nor going out of existence.
This can also mean “all things are eternal,” or others will call this the Buddhist concept of the eternal conservation of energy.
This theory predates Albert Einstein and Isaac Newton.
Note: 不來不去 is not a well-known word for both Buddhists and non-Buddhists, so not all will recognize it.