人心一念 A Single Thought
大聖道:「我已知悔了,但願大慈悲指條門路,情願修行。」這才是:大圣道:「我已知悔了,但愿大慈悲指条门路,情愿修行。」这才是:
逐句解 Line by line
The Great Sage said: "I already know repentance; I only beg the greatly merciful one to point me a path, and I will gladly cultivate myself." This was indeed a case of:
這才是, now this is a case of, is the cue for the closing verse.
Let the human heart give rise to a single thought,
一念 is one thought, a single movement of the mind; the 一 takes yí before the falling tone of 念.
and Heaven and Earth will know it through and through.
The claim is about jurisdiction. One thought and heaven and earth already know — there is no window in which an intention stays private.
If good and evil met with no requital,
The if-clause is a set-up, and the next line knocks it down. 善惡 puts them in the order the maxim needs, good first.
then the cosmos itself must harbor partiality.
乾 is qián in 乾坤, the trigram, not the gān that means dry. The line finishes the argument by making the alternative absurd: if good and evil went unpaid, the universe would be playing favourites — and it does not.
The monkey gives way. His line — 我已知悔了, I know repentance now — is the hinge of his whole arc, the moment defiance turns into a request for directions. The narration marks the weight of it with four lines on how transparent the universe is to a change of mind.
The verse is one of the novel's plainest statements of its moral physics: one thought of the heart is registered instantly by heaven and earth, and good and evil must be paid out, or the cosmos would be crooked. Yu notes how the lines take a private turn and make it a public law — the repentance is logged the moment it happens, and the redemption follows from that.
Plaks reads this as the true climax of the chapter's spiritual argument. Everything since the opening lyric has been bending toward it: the unruly xīnyuán, the mind-monkey,, having exhausted rebellion, at last forms the one right intention, and the machinery of salvation — pilgrim, head-band and journey — can be started up to meet him.