首楞嚴義疏注經 1.381

1.381

「若在處者，為有所表、為無所表？無表同無，表則無定。何以故？如人以表表為中時，東看則西，南觀成北，表體既混，心應雜亂。」

"If it is in a location, is there a marker or is there no marker? If there is no marker, it is the same as non-existent; if there is a marker, then it is indeterminate. Why? Just as when a person sets up a marker to mark the middle, when viewed from the east it is to the west, and when seen from the south it becomes the north. Once the substance of the marker is confused, the mind would have to be confounded."