首楞嚴義疏注經 2.191

2.191

此標勸也。汝應於此所緣境中，試分自他令其差別，自即見性、他即物像。

This is pointing out and exhorting. Within this cognitive realm, you should attempt to divide self and other, causing them to be distinct: 'self' is the nature of seeing, and 'other' is the images of objects.