仁王經疏 2.447

2.447

釋曰：第二明無受用。言不受者，不執著義。不受有四：一行，謂著行；二不行，謂不著行；三非行非不行，即是無記行；四不受一切法。此明三眼於四境中皆不執著，無執著用，故說為空。此皆空故，亦是一義。

Explanation: Second, explaining the function of non-appropriation. "Not appropriated" means the sense of non-clinging. Non-appropriation has four aspects: first, practices, referring to clinging to practices; second, non-practices, referring to not clinging to practices; third, neither practices nor non-practices, which are indeterminate practices; fourth, not appropriating any phenomena. This explains that the three eyes do not cling to any of the four cognitive spheres; lacking the function of clinging, they are therefore said to be empty. Because these are all empty, this is also the meaning of oneness.