仁王經疏 2.453

2.453

釋曰：第三、釋成一義。有其二因：一遮、二表。謂第一義中無染淨相，故言無二。一切諸法，皆悉如故，是一空義。依《本記》有九種義以釋不二，恐繁不述。

The commentary states: Third, explaining and establishing the meaning of "one." It has two causes: first, negation; second, affirmation. That is to say, within the ultimate truth there are no marks of defilement or purity; hence it is said to be "non-dual." Because all dharmas are completely like [suchness], this is the single meaning of emptiness. Relying on the original commentary (*Benji*), there are nine kinds of meanings to explain non-duality, but fearing prolixity, I shall not recount them.