金光明經文句記 3.33

3.33

二、「信相」下，示斷疑相，三：初、所斷疑。二、「四佛」下，能斷法。四種之喻，本曉應長，大師特以四諦解之。若非應壽全是法身、三身一體，何以妙會疏之兩說？故先示云「其言巧妙，其義深遠。」若定喻一身，言豈巧耶？三若並別，義豈深耶？

Second, from 'Ruciraketu' downward, showing the characteristics of severing doubt has three parts: first, the doubt that is severed; second, from 'The four Buddhas' downward, the method capable of severing it. The four metaphors were originally intended to make known the length of the response [lifespan], but the Great Master specifically interpreted them through the four truths. If the response lifespan were not entirely the Dharmakāya and the three bodies a single substance, how could one wondrously unite the two explanations in the commentary? Therefore, it is first indicated: 'Its words are clever and wondrous; its meaning is deep and far-reaching.' If they definitely symbolized only one body, how could the words be clever? If the three were juxtaposed and distinct, how could the meaning be deep?