金光明經文句記 2.186

2.186

二、「量疑」下，明因疑達圓。報身義顯，良由四佛以長壽應釋短壽疑，故使信相達於報智圓具三身。

Second, from "Doubting the span..." onward, it explains reaching the perfect through doubt. The revelation of the meaning of the reward body is truly due to the four Buddhas' resolving the doubt about a short lifespan by responding with a long lifespan, thereby causing Ruciraketu to arrive at the reward wisdom being perfectly endowed with the three bodies.