肇論新疏 3.195

3.195

何則？有者有於無，無者無於有。有無所以稱有，無有所以稱無。然則有生於無、無生於有，離有無無、離無無有，有無相生，其猶高下相傾，有高必有下、有下必有高矣。

"Why is this? Existence exists in relation to non-existence, and non-existence is non-existent in relation to existence. Being existent in relation to non-existence, it is called existence; being non-existent in relation to existence, it is called non-existence. Thus, existence is born from non-existence, and non-existence is born from existence. Apart from existence there is no non-existence, and apart from non-existence there is no existence. Existence and non-existence generate each other, just as high and low tilt into each other: where there is high there must be low, and where there is low there must be high.