仁王經疏 2.437

2.437

釋曰：第二、境智相對以明一義。文別有三：初標、次徵、後釋。此即標宗。且依一門，辨一切法不出境智皆空，故言空空。

Explanation: Second, explaining the meaning of oneness by contrasting sphere and wisdom. The text has three distinct parts: first, stating the thesis; next, questioning; thereafter, explaining. This states the thesis. Provisionally following one approach, distinguishing that all phenomena do not exceed sphere and wisdom, and both are empty, it therefore says "emptiness is empty."