楞伽阿跋多羅寶經註解 4.105

4.105

「色即無常者，謂色即是無常，彼則形處無常，非四大。若四大無常者，非俗數言說。世俗言說非性者，則墮世論，見一切性但有言說不見自相生。」

'As for "form is itself impermanent": it means that form is itself impermanent, and that is the impermanence of shape and location, not of the four great elements. If the four great elements were impermanent, that would not be the discourse of worldly convention. If worldly discourse is not their nature, then one falls into Lokāyata, seeing that all natures are merely discourse and not seeing the arising of their own characteristics.'