“嘘”、“ ”、“呵”、“吹”、“呼”、“嘻”，此六字也。诀云∶肝若嘘时目睁精，
肺知 气手双擎，心呵顶上连叉手，
肾吹抱取膝头平，脾病呼时须撮口，三焦客热卧嘻咛。
“白虎隐于东方，青龙潜于酉位”，此十二字诀也，云转轮法。闭目静坐，叩齿咽津，
口中默念，将十二字一字一圈，作一圆图如轮转，数至三十六遍止。及至收回，从外旋内，
从大至小，念曰∶青龙潜于酉位，白虎隐于东方，亦三十六遍，复归太极而止，是为一周天
。久则不必用意，自然旋转，真有歇手不得处，随则坎（肾）离（心）交，铅（
属坎）汞（属离）合，二物黄，至黄房（戊己居中，规中是也）。戊己真土也，互相吞
啖，两情留恋，盘旋于祖窍之间，自然复此先天之 ，而成混元真一之精，为大药之根原，作还
丹，之基本也。《玉芝》云∶玄黄若也无交媾，争得阳从坎下飞。乃作丹之大端，修仙之第一义
也。然坎离龙虎交，内交也；乾坤子午交，外交也。内交者，使龙虎归于鼎中（脐下），情性合
于窍内，当用“龙从火里出，虎向水边生”之二诀，始得龙虎交矣。外交者，以精气神归玄牝（
此与祖 共窍），窍中与祖气聚会，三家相见（身心意合则三家相见），合为一体，凝于混沌，
抱一无离，为返本还原之要道，龙虎交而结婴儿者此也。
“嘘”、“呬”、“呵”、“吹”、“呼”、“嘻”，这六个字就是六字诀。口诀说：肝脏有病用“嘘”字时，眼睛要睁开以聚精；肺部有病用“呬”字时，双手要举过头顶；心脏有病用“呵”字时，双手交叉置于头顶；肾脏有病用“吹”字时，需抱住膝盖使身体平正；脾脏有病用“呼”字时，嘴唇要撮起呈口哨状；三焦有客热之邪时用“嘻”字，可仰卧并轻声吟诵。
“白虎隐于东方，青龙潜于酉位”，这是十二字诀，也称为转轮法。闭目静坐，叩击牙齿吞咽津液，口中默念，将十二个字每个字对应一圈，画成一个像轮子一样旋转的圆图，数到三十六遍为止。等到收回意念时，从外圈向内圈旋转，由大变小，念诵道：“青龙潜于酉位，白虎隐于东方”，也是三十六遍，最后回归太极状态而停止，这就完成了一周天。时间久了就不必刻意用意，自然就会旋转，真有一种停不下来的感觉，此时肾（坎）与心（离）相交，铅（属坎卦）与汞（属离卦）相合，产生黄芽，到达黄房（戊己居中，即规中穴）。戊己是真土，互相吞食交融，两情留恋，盘旋在祖窍之间，自然恢复先天的元气，形成混元真一之精，作为大药的根源，成为还丹的基础。《玉芝》中说：“玄黄若也无交媾，争得阳从坎下飞。”这是炼丹的大端，修仙的第一要义。然而，坎离龙虎相交是内交；乾坤子午相交是外交。内交，是指使龙虎归于鼎中（脐下），性情在窍内融合，应当使用“龙从火里出，虎向水边生”这两个诀法，才能使得龙虎相交。外交，是将精气神归入玄牝（此处与祖窍共为一窍），在窍中与祖气聚会，三家相见（身、心、意合一即为三家相见），合为一体，凝结于混沌之中，抱持唯一而不分离，这是返本还原的重要道路，也就是通过龙虎相交而结成婴儿的方法。
"Xu" (Hissing), "Si" (Sighing), "He" (Ha), "Chui" (Blowing), "Hu" (Puffing), and "Xi" (Cheering) are these six characters. The mantra states: When the Liver uses "Xu", open the eyes to gather essence; when the Lungs use "Si", raise both hands high above the head; when the Heart uses "He", cross hands and place them on top of the head; when the Kidneys use "Chui", embrace the knees to keep the body level; when the Spleen uses "Hu", purse the lips as if whistling; when the Sanjiao (Triple Burner) has pathogenic heat, lie down and hum "Xi".
"White Tiger hides in the East, Green Dragon潜 (submerges) in the You position" refers to the Twelve-Character Mantra, also known as the Wheel-Turning Method. Close your eyes and sit quietly, click your teeth and swallow saliva, silently reciting in the mouth. Assign each of the twelve characters to one circle, forming a round diagram like a rotating wheel, counting up to thirty-six repetitions. Upon retracting, rotate from the outer circle inward, from large to small, reciting: "Green Dragon submerges in the You position, White Tiger hides in the East," also for thirty-six repetitions, finally returning to Taiji (Supreme Ultimate) to stop. This constitutes one complete cycle (Zhou Tian). With long practice, deliberate intention is no longer needed; rotation occurs naturally, reaching a state where one feels unable to stop. At this point, Kan (Kidney) and Li (Heart) interact; Lead (associated with Kan) and Mercury (associated with Li) combine, producing the Yellow Sprout, arriving at the Yellow Chamber (Wu and Ji occupy the center, which is the Guizhong acupoint). Wu and Ji represent True Earth, mutually swallowing and blending, lingering affectionately, swirling between the Zuoqiao (Ancestral Aperture). Naturally, primordial Qi is restored, forming the Jing (Essence) of Hunyuan Zhenyi, serving as the root of the Great Medicine and the foundation for the Return Elixir. The *Yuzhi* text states: "If Xuanhuang do not couple, how can Yang fly from beneath Kan?" This is the major aspect of alchemy and the primary principle of immortality cultivation. However, the interaction of Kan, Li, Dragon, and Tiger is internal interaction; the interaction of Qian, Kun, Zi, and Wu is external interaction. Internal interaction means causing Dragon and Tiger to return to the Cauldron (below the navel), merging nature and temperament within the aperture. One should employ the two mantras: "Dragon emerges from fire, Tiger arises from water," thereby achieving the interaction of Dragon and Tiger. External interaction involves returning Jing, Qi, and Shen to the Xuanpin (Mysterious Female, here sharing an aperture with Zuoqiao), gathering with Ancestral Qi within the aperture. The Three Families meet (the unity of Body, Mind, and Spirit constitutes the meeting of three families), merging into one entity, condensing into chaos, embracing the One without separation. This is the essential path of returning to the origin, namely the method of forming the Infant through the interaction of Dragon and Tiger.