大方廣圓覺修多羅了義經略疏 1.713

1.713

心託六塵、塵依四大，四大無體，六塵即空，故云散滅。

The mind relies on the six sense objects, and the sense objects rely on the four great elements. Since the four great elements have no substance, the six sense objects are empty; hence they are said to 'disperse and cease.'