大方廣佛華嚴經隨疏演義鈔 38.49

38.49

疏「二橫就所知」等者，一稱理無盡。二無法不窮，故名為盡。下引《法華》第一。《智論》第三，論釋佛是一切智人。彼先難云：所知處無量故，無一切智人。答云：智亦無量，如函大蓋亦大，是一切智人。函喻所知，蓋喻能知。

Regarding the commentary's: "Second, horizontally in terms of what is known," and so forth: First, matching principle, it is inexhaustible. Second, no dharma is not fathomed; hence it is called exhaustible. Below, it cites the first fascicle of the Lotus Sūtra and the third fascicle of the Mahāprajñāpāramitopadeśa, where the treatise explains that the Buddha is an omniscient person (sarvajña). It first objects: Because the objects of knowledge are limitless, there is no omniscient person. The reply states: Cognition is also limitless, like a large box having a large lid; he is an omniscient person. The box is an analogy for what is known; the lid is an analogy for the knowing subject.