先天法象 The Images of the Prior Heaven
行者聞言，近前答曰：「師父啊，你只知月色光華，心懷故里，更不知月家之意，乃先天法象之規繩也。月至三十日，陽魂之金散盡，陰魄之水盈輪，故純黑而無光，乃曰『晦』。此時與日相交，在晦朔兩日之間，感陽光而有孕。至初三日一陽現，初八日二陽生，魄中魂半，其平如繩，故曰『上弦』。至今十五日，三陽備足，是以團圓，故曰『望』。至十六日一陰生，二十二日二陰生，此時魂中魄半，其平如繩，故曰『下弦』。至三十日三陰備足，亦當『晦』。此乃先天採煉之意。我等若能溫養二八，九九成功，那時節，見佛容易，返故田亦易也。詩曰：行者闻言，近前答曰：「师父啊，你只知月色光华，心怀故里，更不知月家之意，乃先天法象之规绳也。月至三十日，阳魂之金散尽，阴魄之水盈轮，故纯黑而无光，乃曰『晦』。此时与日相交，在晦朔两日之间，感阳光而有孕。至初三日一阳现，初八日二阳生，魄中魂半，其平如绳，故曰『上弦』。至今十五日，三阳备足，是以团圆，故曰『望』。至十六日一阴生，二十二日二阴生，此时魂中魄半，其平如绳，故曰『下弦』。至三十日三阴备足，亦当『晦』。此乃先天采炼之意。我等若能温养二八，九九成功，那时节，见佛容易，返故田亦易也。诗曰：
逐句解 Line by line
The Pilgrim, hearing this, came forward and answered: "Master, you know only the moon's bright splendour, and your heart turns to your old home; you do not know that the moon's inner meaning is a rule and measure of the pre-celestial symbols."
Wukong hears a love poem and diagnoses a missed lesson. 先天, the Prior Heaven, is the primordial state before things divided into their opposites; 法象 are the images or patterns that state throws off; and 規繩 is compass-and-marking-line, a craftsman's standard. The claim is that the moon is not scenery but an instrument reading. 更不知 is "moreover do not know," 更 read gèng; 行 is xíng.
"When the moon reaches the thirtieth day, the metal of its yang-soul is wholly dispersed, and the water of its yin-anima fills the disc; so it is pure black and without light, and this is called 'the dark of the moon.'"
The lecture begins at the dark of the moon. The vocabulary to hold on to is a pairing: 魂, the yang-soul, aligned with metal, and 魄, the yin-anima, aligned with water. Over a month the two trade places, and the moon's shape is the readout. Here yang has drained away entirely and the disc is all water, so it shows nothing: 晦, the dark, the month's last day. 散 is sàn, 盡 is jìn.
"At this time it conjoins with the sun, and in the two days of the dark and the new moon, being stirred by the sun's yang it conceives."
And in the dark it conceives. Moon meets sun, takes yang from it, and the cycle restarts — a straightforwardly sexual image, which the inner-alchemical tradition uses without embarrassment. 相交 is to conjoin, 相 read xiāng; 晦朔 are the dark day and the new; 有孕 is to conceive.
"By the third day one yang appears, by the eighth two yang are born; the soul is half within the anima, level as a marking-line — and this is called 'the first quarter.'"
Yang returns in stages, and at the half-moon the two are level. 其平如繩 — level as a plumb-line — is the straight edge of the half-disc, and 上弦, the "upper bowstring," is the first quarter, so called because a half-moon looks like a strung bow.
"By the fifteenth day the three yang are complete and full, and so it is round and whole — and this is called 'the full moon.'"
Full yang, full circle. 團圓 is round and complete — and it is also the ordinary Chinese word for a family reunion, which is why the full moon carries the weight it does at mid-autumn. 望 is the full moon, the fifteenth.
"By the sixteenth day one yin is born, by the twenty-second two yin; now the anima is half within the soul, level as a marking-line — and this is called 'the last quarter.'"
Now it runs backwards. 下弦 is the last quarter, the lower bowstring, and the balance point on the way down.
"By the thirtieth day the three yin are complete, and again it is 'the dark of the moon.'"
And the month closes where it opened. 亦當晦 is "is likewise the dark," 當 read dāng.
"This is the meaning of pre-celestial gathering and refining."
Here is the payoff, and the reason for the whole lecture. 採煉 is gathering and smelting: the adept harvests primal yang at the moment of the cycle when it is there to be had, then refines it. The moon is not an illustration of the process — it is the clock by which you time it.
"If we can nurture the two-times-eight and bring the nine-times-nine to completion, then to see the Buddha will be easy, and to return to the old field easy as well."
Two numbers from the tradition. 二八, "two eights," is sixteen — the eight yin and eight yang ounces that make a balanced whole, borrowed from the sixteen-ounce catty. 九九, "nine nines," is the yang number carried to its limit. 溫養 is to warm and nourish the elixir gently, the long slow phase after the gathering. And 故田, the old field, quietly answers Tripitaka's 故園, the old garden: the homecoming the poem longed for is relocated inside the body. 那 is nà, 佛 is fó.
A poem says:
The tag introducing Wukong's quatrain.
After the first quarter and before the last, the flavour of the medicine is even and balanced, its aspect complete.
Between the two quarters lies the full moon, when yin and yang are level. 藥味 is the flavour of the elixir-medicine, and "even" is the point: balance, not strength, is what makes it usable.
Having gathered it, bring it home to refine in the furnace; set your heart on the work's fruit, and that is the Western Heaven.
And the last line folds the entire journey into the figure. Gather the medicine, bring it home to the furnace, fix the mind on the fruit of the work — and that, says the monkey, is the Western Heaven. The destination stops being a place. 採得 takes 得 as dé; 志心 is to fix the mind; 功果 is the fruit of one's effort.
Wukong answers his master's lyric with doctrine. Where Tripitaka read the moon as beauty and homesickness, Wukong reads it as a working diagram of inner alchemy — 內丹, the "inner elixir," a tradition that took the older laboratory alchemy of furnaces and cinnabar and moved the whole machinery inside the practitioner's body. He walks through the month: the dark moon, yang spent and yin full; the conception of new yang as moon meets sun; one yang and then two returning to the first quarter; the full moon of complete yang; the last quarter as yin waxes again. Each phase is a stage of gathering and refining.
The vocabulary is that of Song and later internal alchemy, in which the adept's body is the crucible and the "medicine" is primal yang, to be harvested at the right point in the cycle, warmed and nourished, and brought to completion through the numerology of the two-eights and the nine-nines. Wukong's closing claim reframes the entire pilgrimage: perfect this inner work and you have already seen the Buddha and already gone home. Notice that his phrase for it, the old field, deliberately echoes the old garden his master's poem ended on.
The exchange stages the novel's habitual layering of a Buddhist frame over a Daoist-alchemical structure, and it quietly re-ranks the two pilgrims. Tripitaka, author of the poem, is here the pupil; Wukong, elsewhere the impulsive troublemaker, is the one who reads the moon properly. His verse makes the point exactly — medicine gathered and refined in the furnace, the mind fixed on the fruit of the work, and that is the Western Heaven. The goal of the quest moves from a distant place to an inner attainment.