大開方便 Open The Gate Of Expedience
因此,兩人比併真假,打至南海,又打到天宮,又曾打見唐僧,打見冥府,俱莫能辨認。故此大膽輕造,千乞大開方便之門,廣垂慈憫之念,與弟子辨明邪正,庶好保護唐僧親拜金身,取經回東土,永揚大教。」因此,两人比并真假,打至南海,又打到天宫,又曾打见唐僧,打见冥府,俱莫能辨认。故此大胆轻造,千乞大开方便之门,广垂慈悯之念,与弟子辨明邪正,庶好保护唐僧亲拜金身,取经回东土,永扬大教。」
逐句解 Line by line
"Because of this, the two of us have matched ourselves true against false: we fought as far as the Southern Sea, and fought on to the Heavenly Palace, and have fought before the Tang Monk and fought before the courts of the shades — and in all of them none could tell us apart.
比併, to match one against the other. The clause runs 打至…又打到…又曾打見…打見… and puts the entire itinerary of the chapter through a single repeated verb: fought, fought, fought, fought.
Therefore we have made bold to intrude. I beg you a thousand times to throw wide the gate of expedient means and let fall the thought of your broad compassion; tell your disciple's deviant from upright, that he may guard the Tang Monk to worship the golden body in person, fetch the scriptures back to the Eastern Land, and exalt the great teaching for ever."
方便之門 is upāya, expedient means — the technical Buddhist term for a teaching adapted to whoever is listening — and Wukong asks for it in its literal sense of a gate to be thrown open. 大教 takes jiào.
The itinerary sentence is the chapter's own table of contents: Southern Sea, Heavenly Palace, the Tang Monk, the courts of the shades — and 俱莫能辨認, none of them could tell. Wukong has been carrying a growing record of failures from court to court, and here it is recited whole to the last of them.
The plea itself is formally beautiful and slightly desperate. 千乞大開方便之門,廣垂慈憫之念 asks for expedient means and for compassion in perfectly balanced seven-character clauses — and then, having asked, Wukong immediately justifies the request by what will come of it: he will guard the master, fetch the scriptures, exalt the teaching. He is arguing that settling his identity serves the mission.
That is a shrewder argument than anything he tried in Heaven, where he pleaded his loyalty and his record. Before the Buddha he pleads the pilgrimage — the one interest he can be certain his audience shares.