医方集解
1.自序
眾藝，可以無方而能善此乎。諸藝之中，醫為尤重，以其為人之司命，而聖人之所以必慎者也。竊嘗思之，凡病必有症，症者，證也，有斯病必形斯候者也。證必有脈，脈者，臟腑經絡、寒熱虛實所由分也。有與證相符者，有與證不相符者，必參驗之，而後可施治者也，察脈辨證，而方立焉。方者，一定不可易之名。有是病者，必主是藥，非可移遊彼此，用之為嘗試者也。方之祖始於仲景，後人觸類擴而充之，不可計殫，然皆不能越仲景之範圍。蓋前人作法後人因焉，創始者難為力，後起者易為功，取古人已驗之成規而斟酌用之，為效不既易乎。然於方之有解，始於成無己，無己慨仲景之書後人罕識，爰取《傷寒論》而訓詁之，詮證方，析微不度考》家之所見不或曰∶善師者不陳，得魚者忘筌，運用之妙，在於一心，何以方為。餘曰∶般不棄規矩，而神取是\x康熙壬戍歲陽月休寧庵汪昂題於延禧堂\x
Among the various arts, can one be capable in this without formulas? Among all the arts, medicine is especially important, because it governs the life of people, and it is what the sages must treat with caution. I have privately pondered: every illness must have symptoms; symptoms are the evidence—having this illness must manifest this sign. The evidence must have a pulse; the pulse is that by which zang-fu organs, meridians and collaterals, cold and heat, deficiency and excess are differentiated. There are cases where [the pulse] accords with the evidence, and cases where it does not accord with the evidence; one must cross-verify them, and only then can treatment be applied. By examining the pulse and differentiating the pattern, the formula is established. A formula is a name that is fixed and cannot be altered. For this illness, one must chiefly use this medicine; it is not something to be shifted about this way and that, or used as a trial. The ancestor of formulas began with Zhongjing; later people extended and expanded by analogy, beyond counting, yet none could surpass Zhongjing's scope. For the predecessors made the rules and later people followed them; the initiator finds it hard to exert effort, while those who rise later find achievement easy. Taking the proven established rules of the ancients and deliberating on their use—is effectiveness not then easy? As for explanations of formulas, they began with Cheng Wuji. Wuji lamented that later people rarely understood Zhongjing's book, and so took the Shanghan Lun and annotated it, explaining the evidence and formulas, analyzing the subtleties without ... What the various schools see is not ... Some say: 'One who is skilled in teaching does not set forth [rules]; one who has caught the fish forgets the trap; the wonder of application lies in a single mind—why use formulas?' I say: Ban [the artisan] does not discard the compass and square, yet attains the divine ... Written by Wang Ang of Xiuning at Yanxi Tang in the yang month of the renxu year of Kangxi.