肾,水脏也。心，火脏也。是心、肾二经为仇敌，似乎不宜牵连而一治之。不知心，肾虽相克而实相须，无
心之火则成死灰，无肾之水则成冰炭。心必得肾气以滋养，肾必得心火而温暖。如人惊惕不安，梦遗精泄，岂非
心肾不交乎？人以惊惕不安为心之病，我以为肾之病；人以梦遗精泄为肾之病，我以为心之病。非颠倒也，实有
至理焉。方用∶
熟地（五两） 山萸（三两） 山药（三两） 人参（三两） 白术（五两） 芡实（五两） 茯神（三两）
菖蒲（一两） 炒枣仁（三两） 远志（一两） 五味子（一两） 麦冬（三两） 柏子仁（三两）
蜜丸，早晚温水送下五钱。
此方之妙，治肾之药少于治心之味。盖心君宁静，肾气自安，肾气既安，何至心动？此治心正所以治肾，而治
肾正所以治心也，所谓心肾相根据。
血分前后，便血出于后阴，尿血出于前阴，最难调治，然总之出血于下也。方用∶
生地黄（一两） 地榆（五钱）
水煎服，二症俱愈。
盖大小便虽各有经络，而其源同，因膀胱之热而来也。生地、地榆俱能清膀胱之热，一方而两用之，盖分之
中又有合也。
腰痛又头痛，上下相殊也，如何治之？治腰乎、治头乎？谁知是肾气不通乎？盖肾气上通于脑，而脑气下达于
肾，上下虽殊，而气实相通。法当用温补之药，以大益其肾中之阴，则上下之气通矣。方用∶
熟地（一两） 杜仲（五钱） 麦冬（五钱） 北五味（二钱）
水煎服，一剂即愈。
方内熟地、杜仲，肾中之药也，腰痛是其专功。今并头痛而亦愈者，何也？盖头痛乃肾气不上达之故，用熟地
补肾之味，则肾气旺而上通于脑，故腰不痛而头亦不痛矣。〔合中有分，分中又有合也〕。
肾，是水脏。心，是火脏。因此，心和肾这两条经络如同仇敌，似乎不应该牵连在一起而用同一方法治疗。然而，心和肾虽然相互克制，但实际上相互依存。没有心的火，身体就会变成死灰；没有肾的水，身体就会像冰炭一样不协调。心必须得到肾气的滋养，肾必须得到心火的温暖。比如人受到惊吓、心神不安，或者睡觉时遗精泄精，这难道不是心和肾不能相交吗？人们把受惊、心神不安当作心的病，我认为这是肾的病；人们把遗精泄精当作肾的病，我认为这是心的病。这并不是颠倒黑白，而是确实有深刻的道理。方剂如下：
熟地（五两） 山萸肉（三两） 山药（三两） 人参（三两） 白术（五两） 芡实（五两） 茯神（三两）
石菖蒲（一两） 炒酸枣仁（三两） 远志（一两） 五味子（一两） 麦冬（三两） 柏子仁（三两）
制成蜜丸，早晚用温水送服五钱。
这个方子的妙处在于，治疗肾的药物少于治疗心的药物。因为心君宁静，肾气自然安定，肾气既然安定了，怎么会引起心动呢？这就是通过治心来治肾，而治肾正是为了治心，这就是所谓的心肾相互依靠。
血分前后，便血是从后阴排出，尿血是从前阴排出，最难调理治疗，但总之都是下部出血。方剂如下：
生地黄（一两） 地榆（五钱）
水煎服用，两种症状都能痊愈。
因为大小便虽然各有其经络，但它们的源头相同，是由于膀胱的热邪引起的。生地黄和地榆都能清除膀胱的热邪，一个方子里同时使用这两种药，这是在分开治疗中又有结合。
腰痛又头痛，上下部位不同，如何治疗？是治腰还是治头呢？谁知道这是因为肾气不通呢？因为肾气向上通达于脑，而脑气向下到达于肾，上下虽然不同，但气实际上是相通的。治疗方法应当使用温补的药物，来大益肾中的阴液，那么上下的气就能通畅了。方剂如下：
熟地黄（一两） 杜仲（五钱） 麦冬（五钱） 北五味子（二钱）
水煎服用，一剂就能痊愈。
方子里的熟地黄、杜仲，是治疗肾的药物，腰痛是它们的主要功效。现在连头痛也好了，为什么呢？因为头痛是由于肾气不能上达的缘故，使用熟地黄补肾的药物，那么肾气旺盛并向上通达于脑，所以腰不痛而头也不痛了。（在结合中有分开，在分开中又有结合）。
The Kidney is the Water Zang-organ. The Heart is the Fire Zang-organ. Thus, the Heart and Kidney meridians are like enemies, seemingly unsuitable to be treated together as one. However, although the Heart and Kidney mutually restrain each other, they actually depend on each other. Without the Fire of the Heart, it becomes dead ash; without the Water of the Kidney, it becomes like ice and charcoal [incompatible]. The Heart must receive Qi from the Kidney for nourishment, and the Kidney must receive warmth from the Fire of the Heart. For instance, when a person is startled and uneasy, or experiences nocturnal emission during sleep, is this not due to the non-interaction between the Heart and Kidney? People consider being startled and uneasy as a disease of the Heart, but I regard it as a disease of the Kidney; people consider nocturnal emission as a disease of the Kidney, but I regard it as a disease of the Heart. This is not inversion, but indeed contains profound truth. The prescription is as follows:
Shu Di Huang (Rehmanniae Radix Praeparata) (5 liang), Shan Yu Rou (Corni Fructus) (3 liang), Shan Yao (Dioscoreae Rhizoma) (3 liang), Ren Shen (Ginseng Radix et Rhizoma) (3 liang), Bai Zhu (Atractylodis Macrocephalae Rhizoma) (5 liang), Qian Shi (Euryales Semen) (5 liang), Fu Shen (Poria with Hostwood) (3 liang),
Shi Chang Pu (Acori Tatarinowii Rhizoma) (1 liang), Chao Suan Zao Ren (Ziziphi Spinosae Semen Preparatum) (3 liang), Yuan Zhi (Polygalae Radix) (1 liang), Wu Wei Zi (Schisandrae Fructus) (1 liang), Mai Dong (Ophiopogonis Radix) (3 liang), Bai Zi Ren (Platycladi Semen) (3 liang).
Made into honey pills, taken orally with warm water, 5 qian in the morning and evening.
The brilliance of this prescription lies in the fact that there are fewer herbs treating the Kidney than those treating the Heart. When the Monarch of the Heart is tranquil, the Qi of the Kidney naturally settles; once the Qi of the Kidney is settled, how can it cause movement of the Heart? Treating the Heart is precisely treating the Kidney, and treating the Kidney is precisely treating the Heart; this is what is meant by the mutual reliance of the Heart and Kidney.
Regarding blood discharge from the front and rear, hematochezia (blood in stool) comes from the posterior orifice, and hematuria (blood in urine) comes from the anterior orifice. These are difficult to regulate and treat, but essentially, they are all bleeding from the lower part. The prescription is as follows:
Sheng Di Huang (Rehmanniae Radix) (1 liang), Di Yu (Sanguisorbae Radix) (5 qian).
Decocted in water and taken orally; both conditions will be cured.
Although urination and defecation have their respective meridians, their source is the same, originating from heat in the Bladder. Both Sheng Di Huang and Di Yu can clear heat from the Bladder. Using them together in one formula represents integration within separation.
Lower back pain accompanied by headache involves different upper and lower parts. How should they be treated? Should one treat the waist or the head? Who would know that this is due to the obstruction of Kidney Qi? The Qi of the Kidney connects upward to the Brain, and the Qi of the Brain descends to the Kidney. Although the locations differ, the Qi is actually connected. The method should employ warming and tonifying herbs to greatly benefit the Yin within the Kidney, so that the Qi above and below will become unobstructed. The prescription is as follows:
Shu Di Huang (Rehmanniae Radix Praeparata) (1 liang), Du Zhong (Eucommiae Cortex) (5 qian), Mai Dong (Ophiopogonis Radix) (5 qian), Bei Wu Wei Zi (Schisandrae Fructus) (2 qian).
Decocted in water and taken orally; one dose brings recovery.
In the formula, Shu Di Huang and Du Zhong are herbs for the Kidney, and relieving lower back pain is their specific function. Why does the headache also heal now? It is because the headache is caused by the failure of Kidney Qi to ascend. By using Shu Di Huang to tonify the Kidney, the Kidney Qi becomes vigorous and ascends to the Brain; thus, the lower back no longer hurts, nor does the head. [Integration contains separation, and separation contains integration.]