大方廣佛華嚴經隨疏演義鈔 23.66

23.66

疏「答中先人後己」下，先利他故。大用四海，即先利他。言「四海」者，一名號海、二四諦海、三變化海、四壽量海。言「自利二海居後」者，即波羅蜜海為因、佛解脫海為果，八九兩會答，故居後。此中唯會六海、不會四海者，以世界海及安立海，依問在前故，佛及眾生本居中故。

In the commentary, from "In the answers, others come first and oneself comes second..." downward, it is because benefiting others comes first. The four oceans of great function are precisely putting benefiting others first. As for the "four oceans": first, the ocean of names; second, the ocean of the four truths; third, the ocean of transformations; fourth, the ocean of lifespan. As for the statement "the two oceans of self-benefit are placed behind", this refers to the ocean of pāramitās as the cause and the ocean of the Buddha's liberation as the fruit; because the eighth and ninth assemblies answer them, they are placed behind. The reason why only six oceans are reconciled here and four oceans are not reconciled is that the ocean of worlds and the ocean of establishments are in front according to the questions, and the Buddhas and sentient beings originally abide in the middle.