維摩經略疏垂裕記 2.193

2.193

二、簡表發，二：初、簡表法身，二：初問、二答。「引二經」者，應必表法，應即法故。

Second, distinguishing what is expressed and initiated, in two parts: first, distinguishing the expression of the dharmakāya, in two parts: first, the question; second, the answer. Regarding "citing the two sūtras": the response must express the Dharma, because the response is precisely the Dharma.