華嚴經探玄記 18.84

18.84

第六正心住中，初舉法勸修內，國名頂者，此在閻浮最南畔處，故云頂也，表第六般若終極故也。海幢者，古人云：定深如海，智勝若幢。又釋：定身獨出名幢，業用繁多云海。設敬辭退中，歎德悲泣者，傷己無始不逢善友，今遇會心原故也。又指示般若門，荷恩深故。

In the sixth abode, the Abode of the Rectified Mind, first, within citing the Dharma to encourage cultivation: The country's name is Śīrṣa (Peak), which is at the southernmost extremity of Jambudvīpa, and is therefore called "Peak", symbolizing the culmination of the sixth [pāramitā], prajñā. Regarding Sāgaradhvaja (Ocean Banner), ancient commentators say: His samādhi is deep like the ocean, and his wisdom is prominent like a banner. Another explanation: The body of samādhi standing out solitary is called banner, and the manifold karmic functions are called ocean. In extending reverence and taking leave, weeping while praising virtues is because he grieves that from beginningless time he had not encountered a good friend, and only now meets one and accords with the source of mind. Furthermore, it is because [the teacher] points out the gate of prajñā, and he is deeply grateful for the kindness.