首楞嚴義疏注經 2.153

2.153

此之明元非本真性，其猶捏目所見之月，本無所有。非月影者，非水中之影也，水中月影從真月降，可喻妙應感而遂通。捏目所觀全體虛妄，從病眼生，堪喻妄見本不可得。只就此見權示無還也。

This 'bright origin' is not the original true nature; it is like the moon seen by pressing the eye, which originally has no existence. That it 'is not a reflection of the moon' means it is not a reflection in water. A reflection of the moon in water descends from the true moon, which can serve as a metaphor for the wondrous response that penetrates wherever stimulated. What is viewed by pressing the eye is entirely false, arising from a diseased eye, and can serve as a metaphor for the false seeing that originally cannot be found. It is solely with respect to this seeing that he provisionally demonstrates that there is nowhere to return.