首楞嚴義疏注經 4.76

4.76

無明生滅形待不息，故云因空生搖。執認所明堅持不捨，故云堅明立礙。於內即是覺明堅執，於外即成金輪次起，故云彼金寶者明覺立堅。故知寶性因覺明有，是故眾寶皆體堅而用明也。

The arising and ceasing of avidyā, in ceaseless contrast and opposition, is why it says, "Due to emptiness, motion arises." Grasping and clinging to what is brightened, holding fast without letting go, is why it says, "solidifying brightness establishes obstruction." Internally, it is the solid grasping of the bright awakening; externally, it constitutes the subsequent arising of the metal wheel; hence it is said, "Those precious metals are established in solidity by the bright awakening." Thus we know that the nature of precious metals exists because of the bright awakening; therefore, all precious substances have solidity as their substance and brightness as their function.