US-P18.109ab ।US-P18.109cd ॥
In plain words
A mirror holding a reflection shaped like a face — that reflection is taken for the face. And in exactly that way: the cognition is a mirror, and when a reflection falls in it, that, precisely, is what is called 'I'.
Close to the Sanskrit
But the mirror — when there is a reflection having the form of the face — that is indeed that. Just as thus, so the mirror of cognition: when there is a reflection, then indeed it is 'I'.