The Two Wings of Confucianism: Uncovering the Roots of a Fracture

PROJECT DESCRIPTION: Despite holding the same metaphysical views, mastering the same curriculum, passing the same examination systems, and venerating the same thinkers from their tradition (namely, Confucius and Mencius), the Neo-Confucian philosophers of the Song-Ming period (ca 10th to 17th centuries CE) disagreed in sharp and strident ways on questions concerning the proper sources of ethical knowledge and the proper methods of self-cultivation.

The Intuitive Wing (also known as the Lu-Wang 陸王 school or School of Mind 心學) advocates a central method of self-cultivation: attentive introspection of one's mental activity. This involves monitoring one's mind and learning to recognize liangzhi (良知), an innate faculty of perception and moral guidance. Neo-Confucian metaphysics posits patterns or principles (li 理) that permeate the universe, explaining broad regularities in human and natural worlds. These patterns also inhere in one's mind, and in their purest form, comprise liangzhi. Typically, selfish desires obscure access to this faculty. However, through rigorous self-scrutiny and meditation, one can remove these desires and other biases, allowing liangzhi to guide one's actions. Over time, this leads to consistently right behavior in harmony with the world.

In contrast, the Investigative Wing (known as the Cheng-Zhu 程朱 school or School of Pattern 理學) views this introspective approach as overly subjective. While not denying liangzhi's existence, they consider attempts to isolate it through introspection impractical. Instead, they advocate clarifying one's mental patterns by understanding those in the external world. This approach, called gewu (格物) or "investigation of things," encompasses study of contemporary affairs, classical texts, social and political history, human dynamics, and natural patterns. Such comprehensive, reverential study uncovers the principles (li 理) permeating the cosmos, revealing how everything interconnects and how universal harmony is achievable. For the Investigative Wing, this knowledge—not introspection—leads to moral clarity and right action.

The disagreement between these wings persisted for centuries, with each side accusing the other of misunderstanding the tradition they collectively revered. What caused this division? Why did it endure?

In this monograph, I argue that the fracture is an artifact of a particular Song reading of Mengzi (aka Mencius, fl. ca. 4th century BCE) that, once enshrined as orthodoxy through the Sishu and the examination system, generated downstream pressure neither wing could resolve. On this reading, Mengzi is a moral nativist: the human mind contains the beginnings or sprouts (duan 端) of moral knowledge and virtue; morality is something we bring to the world prior to experience; focusing (si 思) on these natural inclinations is sufficient to lead most people to goodness. The famous "child falling into the well" passage gets read as evidence for an innate moral organ. The liangzhi of 7A15 gets read as a faculty of moral perception. The whole project of Confucian self-cultivation gets reoriented around accessing what is already within.

This reading is not Mengzi's. I argue (in the companion volume to this project) that Mengzi was a practical governance thinker, and that what the Song tradition reads as a psychology of innate virtue is in fact a structural account of how concrete regulatory programs produce the conditions under which ordinary people develop relational competencies. Liangzhi in 7A15 is not a faculty but a denominative construction. The sprouts are not evidence for an innate moral organ but an analogy about cultivation conditions. Renzheng 仁政 is a regulatory program, not a meditative ideal.

The classical commentators broadly read Mengzi this way. Zhao Qi (ca. 108–201 CE) and Sun Shi (962–1033 CE) preserve a recognizably political and structural Mengzi. It is Zhu Xi (1130–1200) whose commentary inaugurates the introspective reading—turning denominative competencies into psychological faculties, turning the sprouts into evidence for innate moral organs, turning the practitioner of the dao of Yao and Shun into a contemplative whose primary task is interior. Once that reading became canonical, both wings of the Song-Ming tradition inherited it. They argued over the right way to operationalize a Mengzi who never existed.

This relocates the fracture. The standard view (Ivanhoe 2000; Slingerland 2007; Nichols et al. 2018) treats Mengzi's nativism as a genuine philosophical departure from Kongzi and Xunzi—a real fault line within classical Confucianism that finally erupts in the Song. On the view I'll defend, that fault line is itself partly a Song construction, retrojected onto the classical period by readers who took Zhu Xi's Mengzi for the historical one. Xunzi's polemic against Mengzi becomes a real but more circumscribed disagreement, not the foundational fissure later scholarship has made of it. The Neo-Confucian consensus that masked an unbridgeable divide (Graham 1992) was a consensus on a misreading; the divide was unbridgeable because the misreading made it so. Once Mengzi has been turned into an introspectionist, there is no principled way to settle whether the introspection should be direct (liangzhi) or mediated through investigation (gewu). Hence Lu-Wang versus Cheng-Zhu.

So why did the Song read Mengzi this way? Several factors are worth weighing. One is dialectical: the introspective Mengzi provides a foundation for Neo-Confucian metaphysics in a way the political Mengzi does not. Another is pedagogical: a Mengzi who locates moral guidance in the heart-mind offers a more tractable program of self-cultivation than one who locates it in regulatory architecture. Another is institutional: the Song state had reasons to favor a Mengzi whose ethical program could be internalized by examination candidates rather than one who positioned himself to advise rulers as 卿. And a fourth is hermeneutic: certain passages in the Mengzi genuinely lend themselves to introspective readings if one is not attending to the commentarial tradition that read them otherwise.

In this project, I will work through these explanations, examining each interpretation's strengths and weaknesses. I will trace the commentarial trajectory from Zhao Qi through Sun Shi to Zhu Xi, identifying the specific passages where the introspective reading gets installed and the philosophical work it does once it is in place. The aim is to illuminate not only what happened to Mengzi in the Song, but why the resulting picture proved so unstable that it broke into two wings, and why the fracture endured.

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