大方廣佛華嚴經疏 6.33

6.33

第六得普門等者，佛以稱法性之總持，包攝一切總持，故云普門；復能流演無盡，故得稱海。此於聞思有忘失障得解脫也。

In the sixth, "attaining the universal approach," and so on, means that with a dhāraṇī that matches dharmatā, the Buddha encompasses all dhāraṇīs, hence it is called a "universal approach"; furthermore, it can flow forth inexhaustibly, hence it can be called an "ocean." This attains liberation from the obstacle of forgetting in hearing and reflecting.