尝谓形容气色脉病声音。有时相应。有时不相应。非相应者可凭。而不相应者不可凭也。盖有常焉。有变
焉。因常可识其同。因变可知其异。故四诊分观。则各有所当。四诊合论。亦皆有可凭。自其同者言之。诊不
变。治亦不变。自其异者言之。诊无常。治亦无常。然而常变不离五行。异同难逾四诊。参而伍之。错而综之。
虽虚实不齐。脏腑相胜。而生克可推。吉凶可断焉。试先以气色声音。合而参之。如肝色青。其声呼。其音角。
心色赤。其声笑。其音征。脾色黄。其声歌。其音宫。肺色白。其声哭。其音商。肾色黑。其声呻。其音羽。有是气色。
有是声音。此为相应。若见其气色。而不闻其声音。或闻其声音。而不见其气色。则五脏有盛衰。五行有生
克矣。假令望见青之气色。而不闻角之声音。反得心之声音者。木生火也。得肾之声音者。水生木也。此相
生之谓也。得脾之声音者。木克土也。得肺之声音者。金克木也。此相克之谓也。五色五音。皆可比例以相
参也。然气色有微甚。声音有盛衰。病症有虚实。又当因诊以通其变矣。要之相生者顺。相克者逆。气色克
声音者。其死速。声音克气色者。其死迟。气色生声音者。其愈速。声音生气色者。其愈迟。声色相应。而无过
不及者。平人也。声色相应。而有过不及者。病患也。腑病多相生。脏病多相克。太过者病在腑。不及者病在
脏。脏腑相乘。可由是而推也。此气色声音合参之旨也。至若病之定名。症之定候。其中又各有形容。各有
宜忌。惟精于病症诸书。熟于疗治诸法。识其常。通其变。胸有成竹。目无全牛。庶可迎刃而解矣。
我曾说过，人的形体神态、气色、脉象、病状与声音，有时是相互对应的，有时则不相对应。对于相互对应的情况可以凭据诊断，而对于不相对应的情况则不可单凭此一点来断定。这是因为其中既有常规规律，又有变化情形。通过常规规律可以识别其共同点，通过变化情形可以了解其差异点。因此，将望、闻、问、切四诊分开观察，各自都有其适用的方面；将四诊综合论述，也都有可凭据之处。从它们相同的一面来看，诊断方法不变，治疗方法也不变；从它们不同的一面来看，诊断没有固定的常法，治疗也没有固定的常法。然而，常规与变化都不离五行（木、火、土、金、水）的范畴，异同也难以超出四诊的范围。将四诊参互比较，错综综合地分析，虽然虚实情况各不相同，脏腑之间相互克制，但可以通过生克关系推演病情，判断吉凶预后。
现在先以气色和声音合参为例进行说明：肝的气色为青色，其发声为呼，其音调属角；心的气色为赤色，其发声为笑，其音调属征；脾的气色为黄色，其发声为歌，其音调属宫；肺的气色为白色，其发声为哭，其音调属商；肾的气色为黑色，其发声为呻，其音调属羽。如果有这样的气色，就有这样的声音，这叫做相应。如果看到了某种气色，却听不到相应的声音，或者听到了某种声音，却没看到相应的气色，这就说明五脏有盛衰的变化，五行有生克的异常。
举例来说，如果望见青色的气色（属肝/木），却听不到角音（属肝/木）的声音，反而听到心音（属心/火），这是木生火的关系；如果听到肾音（属肾/水），这是水生木的关系，这叫做相生。如果听到脾音（属脾/土），这是木克土的关系；如果听到肺音（属肺/金），这是金克木的关系，这叫做相克。五色与五音都可以按照这种比例关系进行参互验证。
然而，气色有深浅浓淡之分，声音有强弱盛衰之别，病症有虚实之异，又应当根据诊察结果来通晓其变化。总之，相生者为顺证，相克者为逆证。气色克声音者，死亡迅速；声音克气色者，死亡较迟；气色生声音者，痊愈迅速；声音生气色者，痊愈较慢。声色相应，且无过度或不及的情况，属于平人（健康人）。声色相应，但有过度或不及的情况，属于病患。腑病多表现为相生关系，脏病多表现为相克关系。太过者病在腑，不及者病在脏。脏腑之间的相乘关系，可以由此推演出来。这就是气色声音合参的要旨。至于疾病的定名、症状的定候，其中又各有具体的形容和宜忌。只有精通病症方面的书籍，熟悉治疗方面的各种方法，认识其常规，通晓其变化，做到胸有成竹、目无全牛（比喻技艺纯熟，洞察本质），才可以迎刃而解。
I have often stated that a person's physical appearance, complexion (Qi-se), pulse, disease manifestations, and voice may sometimes correspond with each other, and sometimes not. Correspondence can be relied upon for diagnosis, whereas non-correspondence cannot be solely depended upon. This is because there are both constant patterns and variable changes. By understanding the constants, one can identify similarities; by understanding the variables, one can discern differences. Therefore, when observing the Four Diagnostic Methods (Wang, Wen, Wen, Qie) separately, each has its specific applicability; when synthesizing them, all provide reliable basis. From the perspective of their similarities, if the diagnostic approach remains constant, the treatment also remains constant. From the perspective of their differences, since diagnosis lacks fixed constants, treatment likewise lacks fixed constants. However, both constancy and variability do not depart from the Five Elements (Wood, Fire, Earth, Metal, Water), and similarities and differences do not exceed the scope of the Four Diagnostic Methods. By cross-referencing and synthesizing these factors, although deficiency and excess conditions vary and Zang-Fu organs interact through overcoming relationships, the principles of generation and restriction can be deduced to predict outcomes and prognosis.
Let us first examine the synthesis of complexion and voice. The liver manifests as cyan color (Qing), vocalizes with calls (Hu), and corresponds to the Jue pitch; the heart manifests as red color (Chi), vocalizes with laughter (Xiao), and corresponds to the Zhi pitch; the spleen manifests as yellow color (Huang), vocalizes with singing (Ge), and corresponds to the Gong pitch; the lungs manifest as white color (Bai), vocalize with weeping/crying (Ku), and correspond to the Shang pitch; the kidneys manifest as black color (Hei), vocalize with groaning (Shen), and correspond to the Yu pitch. When such a complexion matches such a voice, this is called "correspondence." If one observes a specific complexion but does not hear the corresponding voice, or hears a specific voice without seeing the corresponding complexion, it indicates imbalance in the Zang organs and abnormal interactions among the Five Elements.
For example, if one observes a cyan complexion (associated with Wood/Liver) but does not hear the Jue pitch (Wood), yet hears the Zhi pitch (Fire/Heart), this reflects the generating relationship of Wood producing Fire. If the Yu pitch (Water/Kidney) is heard, this reflects Water generating Wood. This is referred to as the Generating Cycle (Xiang Sheng). If the Gong pitch (Earth/Spleen) is heard, this reflects Wood overcoming Earth; if the Shang pitch (Metal/Lung) is heard, this reflects Metal overcoming Wood. This is referred to as the Restricting/Overcoming Cycle (Xiang Ke). The Five Colors and Five Pitches can all be analyzed proportionally in this manner.
However, complexions vary in intensity, voices vary in strength, and diseases differ in deficiency and excess. One must therefore adapt to these variations based on diagnostic findings. In summary, generating relationships indicate favorable progression (Shun), while restricting relationships indicate unfavorable progression (Ni). If the complexion restricts the voice, death occurs rapidly; if the voice restricts the complexion, death occurs slowly. If the complexion generates the voice, recovery is rapid; if the voice generates the complexion, recovery is slow. When voice and complexion correspond without excess or deficiency, the individual is a Ping Ren (healthy person). When they correspond but exhibit excess or deficiency, the individual is a patient. Diseases of the Fu organs often show generating relationships, while diseases of the Zang organs often show restricting relationships. Excess conditions typically involve the Fu organs, while deficiency conditions typically involve the Zang organs. The mutual multiplication (Cheng) between Zang and Fu can be deduced from these principles. This constitutes the essence of synthesizing complexion and voice. Regarding the specific naming of diseases and the characterization of symptoms, there are further nuances and contraindications. Only by mastering texts on disease syndromes, being proficient in various therapeutic methods, recognizing constancies, and comprehending variables—thereby possessing a clear mental image and perceiving the essence rather than just the surface—one can resolve cases effortlessly.