說無垢稱經疏 3.419

3.419

贊曰：此第四重，說俗心作，如水中月。水實無月，心妄謂有，不知以水為緣，還見本月。一切世俗皆心所作，不知自心，謂有外境。鏡中之像亦無實像，以鏡為緣，還見本面。心之所取亦復如是，不知自心，謂離心有。鏡中之像若實有者，見去何不去？觀來何不來？彼鏡既不真，諸俗皆如是。

The Commentary says: This is the fourth level, explaining that the conventional is created by the mind, like the moon in water. In the water there is truly no moon, yet the mind falsely supposes it to be there, not understanding that taking the water as a condition, one only sees the original moon. All conventional phenomena are created by the mind; not understanding one's own mind, one supposes that external objects exist. The image in a mirror likewise has no real image; taking the mirror as a condition, one merely sees one's original face. What is grasped by the mind is also like this: not understanding one's own mind, one supposes it exists apart from the mind. If the image in the mirror were truly existent, when the viewer departs why does it not depart? When the observer approaches why does it not approach? Since that mirror-[image] is not real, all conventional things are like this.