The founding master of Southern Song Mind-Learning, known as Master Xiangshan. He challenged Zhu Xi's objective Neo-Confucianism with the sweeping claims that "the mind is Principle" and "my mind is the cosmos," denouncing Zhu's outward investigation of things as trivial and fragmented. At the historically famous "Goose Lake Gathering," he debated Zhu Xi face-to-face on the proper method of learning, advocating the direct "simple and easy practice" and "illuminating the original mind" in place of the gradual pursuit of external principles, thereby inaugurating the Mind-Learning tradition that stood as a twin peak against Cheng-Zhu Neo-Confucianism.
Lu Jiuyuan, courtesy name Zijing, a native of Jinxi in Fuzhou, Jiangxi. Exceptionally precocious from childhood, at three or four he asked his father "Where does heaven and earth end?" His father laughed without answering, and the boy meditated so deeply he forgot to eat and sleep. As a youth, reading the ancient texts to the word "cosmos," he saw the commentary: "The four directions above and below are space; what has been and what will be is time," and suddenly achieved great awakening: "The affairs of the cosmos are my own affairs; my own affairs are the affairs of the cosmos"—laying the foundation of his philosophy of mind. He passed the jinshi examination in the eighth year of Qiandao and held posts such as registrar in Jing'an and rectifier of the National University. He later taught at Xiangshan for many years, and students came from all directions, audiences often numbering in the hundreds. His bearing was grand and upright, and he was exceptionally capable in governance. Though his doctrine opposed Zhu Xi's, they respected each other. In the second year of Chunxi, Lu Zuqian invited the two to meet at Goose Lake Temple in Xinzhou—the legendary "Goose Lake Debate." They debated for days, each holding firm to their views without reaching consensus, yet achieving one of the most luminous intellectual dialogues in the history of Chinese philosophy.
Lu Jiuyuan's core proposition is "the cosmos is my mind; my mind is the cosmos"—the principle of the cosmos and the principle of the mind are fundamentally one. Principle is not outside the mind but within it: "mind is principle." Methodologically, he insists on "the simple and direct method" (yi jian gong fu), opposing Zhu Xi's gradual accumulation of investigating one thing today and another tomorrow. He主张 "first establish the great"—directly apprehending the totality of the original mind, which is self-sufficient and needs no external seeking. On reading, he boldly declares: "If learning grasps the root, the Six Classics are all my footnotes." Classics are merely corroborations of the mind's principle, not external authorities; the scholar should use the mind to verify the classics, not use the classics to constrain the mind. His philosophy emphasizes the self-awareness and self-establishment of the moral subject, carrying a strong sense of individual spiritual liberation.
"The cosmos is my mind; my mind is the cosmos. Mind is principle. If learning grasps the root, the Six Classics are all my footnotes. — Xiangshan Quanshu"
Lu Jiuyuan's "the mind is Principle" and Zhu Xi's "Principle precedes qi" clashed at the Goose Lake Gathering. Was this grand debate essentially the Chinese version of "rationalist apriorism" versus "nominalism/empiricism"?
Lu Jiuyuan's "mind is principle" and Augustine's "return to the inner self to find God" both主张 that ultimate truth is not in external things but in the subject's own mind, reached through inward introspection to directly touch the substance.
Can ultimate truth be found within the mind without external authority? Do the innatist philosophies of Lu Jiuyuan and Augustine converge on the same insight about the inwardness of truth, or do their fundamentally different commitments make them incommensurable?
Lu Jiuyuan takes the mind as the legislator of the cosmos; Descartes takes "I think" as the Archimedean point of all knowledge. Both start from subjectivity to establish the absolute starting point of philosophy.
Can subjectivity serve as the absolute foundation of philosophy? Do the subject-centered philosophies of Lu Jiuyuan and Descartes represent parallel modern turns, or do their different metaphysical commitments make them fundamentally different?
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