首楞嚴義疏注經 1.447

1.447

將陳法利，宜先表報警動令信也。前放頂光，表體無說。此從口放，欲顯言詮。聲色用中無非智體，種種百千具足眾德，破無明暗如日之照。

About to explain the benefits of the Dharma, it was fitting first to manifest an announcement to startle them into faith. Previously, emitting light from his crown signified that the essence is beyond expression. Here, emitting it from his mouth is intended to reveal verbal explanation. In the functioning of sound and form, there is nothing that is not the essence of wisdom; the various kinds and hundreds of thousands [of rays] are replete with all virtues, destroying the darkness of avidyā like the illumination of the sun.