"Nothing" does not exist, while what exists must always exist. Existence is a concept, while non-existence is something that cannot be possible. The sense of generation and change is only a superficial phenomenon based on sensual perception, and behind it, there is only one truth. The true existence is permanent, ungenerated, indestructible, and unchanging. The contrary concept to it is as long as there's a void, the world can continue to move across it.