維摩經玄疏 1.16

1.16

又，〈佛國品〉明寶積獻蓋，請問淨土；佛所演答，具說佛國因果，即是明宗也。

Furthermore, the 'Buddha-land Chapter' clarifies Ratnakūṭa offering the parasol and inquiring about the pure land; the Buddha's expounded answer fully explains the cause and effect of the buddha-lands, which is clarifying the central theme.