首楞嚴義疏注經 2.213

2.213

又若汝執見性是物，亦應彼物即是於見。如是則應汝見物時，物亦見汝，斯則人物如何分辨？物體見性自然雜亂，物即是汝、汝即是物，世間一切俱不成立，如何名為安立諦耶？

Furthermore, if you cling to the view that the nature of seeing is an object, that object should likewise be the seeing. If so, then when you see the object, the object should also see you; in that case, how could persons and objects be distinguished? The substance of objects and the nature of seeing would naturally be mixed and confused: objects would be you, and you would be objects; nothing in the world could be established. How could it then be called the truth of establishment?