五行山真言 The Mantra on the Mountain
菩薩帶引木吒行者過了此山，又奔東土。行不多時，忽見金光萬道，瑞氣千條。木吒道：「師父，那放光之處，乃是五行山了，見有如來的壓帖在那裡。」菩薩道：「此卻是那攪亂蟠桃會、大鬧天宮的齊天大聖，今乃壓在此也。」木吒道：「正是，正是。」師徒俱上山來，觀看帖子，乃是「唵嘛呢叭𠺗吽」六字真言。菩萨带引木咤行者过了此山，又奔东土。行不多时，忽见金光万道，瑞气千条。木咤道：「师父，那放光之处，乃是五行山了，见有如来的压帖在那里。」菩萨道：「此却是那搅乱蟠桃会、大闹天宫的齐天大圣，今乃压在此也。」木咤道：「正是，正是。」师徒俱上山来，观看帖子，乃是「唵嘛呢叭𠺗吽」六字真言。
逐句解 Line by line
The Bodhisattva led Moksa past this mountain and made again for the Eastern Land.
了 is the light le and 奔 is bēn, to hurry. Three recruits signed up, and the journey east resumes in a single clause.
They had not gone far when of a sudden they saw ten thousand shafts of golden light and a thousand strands of auspicious vapor.
In 不多時 the 不 keeps bù before the level tone of 多.
Moksa said: "Master, that place giving off the light is the Mountain of Five Phases, where the Tathāgata's sealing-talisman is set."
壓帖 is the paper seal, stamped with a spell, that holds Sun Wukong down. A slip of paper is doing the work of a mountain.
The Bodhisattva said: "That would be the Great Sage Equal to Heaven, who threw the Peach Festival into chaos and made havoc in the Palace of Heaven, now pinned fast beneath it."
齊天大聖, Great Sage Equal to Heaven, is the title Sun Wukong awarded himself during the rebellion. He is still using it.
Moksa said: "Just so, just so."
正是正是 doubles the yes, the same way the boar did at his conversion. Huian's agreement is the last thing anybody says before the mountain comes into view.
Mistress and disciple climbed the mountain together and looked at the talisman: it was the Six-Syllable Great Mantra, "Oṃ maṇi padme hūṃ."
The seal turns out to be the Six-Syllable Mantra of Avalokiteśvara — 唵嘛呢叭𠺗吽, ǎn má ní bā mī hōng, Sanskrit oṃ maṇi padme hūṃ, the most recited phrase in Buddhism. The fifth character, 𠺗, is a rare one that stands where the usual 咪 would be and is read mī in its mantra role.
Guanyin arrives at the Mountain of Five Phases, where Sun Wukong has lain pinned since the end of the previous chapter. The glare that announces it, and Moksa's recognition of the seal, build toward the chapter's pivot: her first sight of the monkey she means to make chief disciple of the pilgrimage.
The seal turns out to be the Six-Syllable Mantra, 唵嘛呢叭𠺗吽 — Oṃ maṇi padme hūṃ, the most widely recited invocation of Avalokiteśvara, which is to say of Guanyin herself. That her own mantra is the thing holding him down is richly apt: the formula of compassion doing duty as a lock. And she has now come in person to start turning that confinement into a release.
Yu notes how the moment ties the cosmological to the devotional. The Five Phases that the physical world is built from, the Buddha's seal, and the bodhisattva's mantra bear down together on one figure — Daoist, Buddhist and liturgical orders converging on the xīnyuán, the mind-monkey waiting underneath for his conversion.