The reason for this is this: If the existence of things is true (absolute) existence, this existence should be eternal by its own nature and should not depend on causes to be existent. If the nonexistence of things were absolute nonexistence, it should be eternal nonexistence by its own nature and should not depend on causes to be nonexistent. If existence is not existence by its own nature but depends on causes to be existent, we know that although it [appears to] exist, it has no true existence. Since it has no true existence, it cannot be called existence in the real sense although it exists.

(Seng-Chao)