俱舍論疏 8.173

8.173

論「又陜水上至二色俱生」，第二兩岸互見分明。即是一處有二像色，曾無一處並見二色，故知無有實像一處並生。

On the passage in the śāstra from "Furthermore, over narrow water" to "two color-forms arise together": Second, both banks are distinctly visible to each other. This means that two reflective color-forms occupy a single place; but two color-forms have never been seen to coexist in one place, so we know that real reflections do not arise together in a single place.