仁王經疏 3.223

3.223

問：豈不虛空及非擇滅非無漏智境，如何無相智得證三無為？解云：諸宗不同。薩婆多宗，不許無漏智緣二無為。依大乘宗，於真如上假安立故，許緣無失。

Question: Are not space and non-analytical cessation non-objects of uncontaminated wisdom? How can signless wisdom realize the three unconditioned states? Solution: The various schools differ. The Sarvāstivāda school does not allow uncontaminated wisdom to take the two unconditioned states as objects. According to the Mahāyāna school, because they are nominally designated upon tathatā, allowing them as objects is without fault.