仁王護國般若波羅蜜多經疏 2.554

2.554

解曰：無有本自二者，明諦體也。俗有真無，故云有無。從本已來性相依持，體非即離，故云自二。譬如牛二角者，謂真俗諦若俗智緣，故見二也。照解見無二者，明其真智離相絕待，證無二也。二諦常不即者，謂由證解無二相也。若真俗有二可相即，真俗諦無二無所即。從此第二明遣一二。

The commentary: "Existence and non-existence are originally two" clarifies the essence of the truths. The conventional is existent and the real is non-existent, hence it says "existence and non-existence". From the beginning, nature and characteristics mutually rely upon each other, and their essence is neither identical nor separate, hence it says "originally two". "Just like the two horns of an ox" means that if conventional cognition takes the ultimate and conventional truths as objects, it sees two. "Illuminating understanding sees no duality" clarifies that real cognition, free from marks and transcending relativity, realizes non-duality. "The two truths are never identical" means that through realization and understanding there is no mark of duality. If the real and conventional had duality, they could be identical; but since the ultimate and conventional truths have no duality, there is nothing to be identical with. From here, the second part clarifies the dispelling of oneness and twoness.