A titan of the mid-Qing Qianjia evidential research school, who distilled from textual and phonological scholarship a thought of brilliant humanist enlightenment. With the ontology of "qi transformation is the Way" and the ethics of "Principle exists within desire," he mounted an unprecedentedly fierce assault on the Song-Ming Neo-Confucian asceticism of "preserving Heavenly Principle and extinguishing human desire," denouncing its essence as "killing with Principle" and constituting the most profound humanist critique from within traditional Chinese thought.
Dai Zhen, courtesy name Dongyuan, a native of Xiuning, Anhui. Born into a petty merchant family, he was poor in childhood and traveled with his father as a trader in Nanfeng, Jiangxi. He could not speak until age ten, but once he began his education, he displayed astonishing talent. Reading the Commentary on the Great Learning, he immediately questioned Zhu Xi's interpretation. Too poor to hire a teacher, he was entirely self-taught, mastering astronomy, mathematics, phonology, textual criticism, and geography, becoming the most erudite scholar of the Qian-Jia era. At over thirty he entered the capital, where his scholarship shook the scholarly community; Qian Daxin, Ji Yun, and Wang Mingsheng all lowered their standing to befriend him. In his later years he joined the compilation office of the Complete Library of the Four Treasuries (Siku Quanshu), responsible for collating astronomical, mathematical, and geographical works. In the fortieth year of Qianlong, he was specially granted the juren-level degree and appointed Hanlin Academy bachelor. His final work, Evidential Commentary on the Meaning of the Terms in the Mencius (Mengzi Ziyi Shuzheng), uses textual criticism as method and philosophical critique as destination, elevating Qian-Jia evidential learning to the height of intellectual critique. Liang Qichao called it "the most valuable extraordinary book in three hundred years."
Dai Zhen takes "the transformation of qi is the Dao" as his cosmological core: the cosmos is not the unfolding of suspended heavenly principle but the natural process of material qi's eternal great transformation. The Dao is the process of qi's transformation itself, not an independent substance above it. In ethics, he proposes "principle resides in desire"—principle is not an abstract law opposed to desire but the reasonable, measured satisfaction and realization of desire. "In the world there is no principle without feeling; to kill with principle is the greatest weapon." He fiercely critiques the Neo-Confucian "preserving heavenly principle and eliminating human desire," arguing that when principle is divorced from the concrete desires of life and becomes a suspended external authority, it becomes the tool of the powerful to oppress the powerless: "The superior uses principle to blame the inferior; the elder uses principle to blame the younger; the noble uses principle to blame the base; even when they are wrong, it is called 'compliance.'" Epistemologically, he主张 "blood, qi, and mind-knowledge," holding that human cognitive capacity (mind-knowledge) is built on physiological foundations (blood and qi), thereby pulling the ground of philosophy from metaphysics back to lived experience.
"Principle resides in desire. The Neo-Confucians' preserving principle and eliminating desire is using principle to kill! A principle without feeling is the greatest weapon of killing. — Evidential Commentary on the Meaning of Terms in the Mencius"
How does Dai Zhen's sharp exposure of feudal rulers using suspended moral "Heavenly Principle" to murder the desires of the common people parallel the genealogical critiques of morality and power by Nietzsche and Foucault?
Dai Zhen grounds cognition in "blood, qi, and mind-knowledge"; Hume traces all ideas to sensory impressions. Both ground knowledge in concrete life-experience rather than a priori reason.
Can the grounding of knowledge in sensory-bodily experience genuinely replace metaphysics? Do the empiricist philosophies of Dai Zhen and Hume represent parallel discoveries of the same insight, or fundamentally different intellectual projects?
Dai Zhen holds that principle is within desire, opposing asceticism; Kant holds that reason legislates to constrain sensible impulses. They represent naturalism and rationalism—two diametrically opposed paths in the principle-desire relationship.
Should morality be grounded in natural desire or in rational legislation? Do the different moral philosophies of Dai Zhen and Kant represent complementary truths or fundamental incompatibility?
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