金光明經文句 1.20

1.20

「諸佛行處」者，正顯佛智無量甚深。佛智無量甚深故行處亦無量甚深，行處無量甚深故佛智亦無量甚深。舉函顯蓋、舉蓋顯函，正在此也。

"The sphere of practice of all Buddhas" directly demonstrates that the Buddha's wisdom is immeasurable and profound. Because the Buddha's wisdom is immeasurable and profound, his sphere of practice is also immeasurable and profound; because his sphere of practice is immeasurable and profound, the Buddha's wisdom is also immeasurable and profound. Pointing to the box to reveal the lid, pointing to the lid to reveal the box—this is precisely what is here.