Everything in the universe is made of the same primordial substance called qi

Ideas & Philosophy · Published 3 October 2026 Swipe more like this →

In short: Zhang Zai, an influential Song dynasty philosopher, proposed that all existence—from rocks to humans—shares a single, fundamental essence. By understanding this vital force, he argued that individuals could achieve a profound moral connection with the cosmos, distinguishing his vision from the detachment often associated with Buddhism and Daoism.

Born in 1020 CE, Zhang Zai initially explored military interests and religious alternatives like Buddhism and Daoism before returning to Confucianism. His mature philosophy, centered on the concept of qi, posits that this primordial substance is the building block of all reality. When qi is rarefied, it remains invisible, but it condenses to form the tangible world. Because everything is composed of this shared essence, Zhang argued that the universe is not an empty void but a dynamic, interconnected system governed by the constant interaction of yin and yang.

This metaphysical framework led to his signature ethical teaching: the idea that a sage can achieve a state of total unity with the cosmos. By recognizing that humaneness is woven into the very fabric of existence, Zhang believed individuals could realize their full potential. Unlike traditions that seek to escape the world, Zhang’s Confucianism emphasizes finding purpose and identity within the perpetual changes of the physical realm. He maintained that while all things follow a uniform pattern of transformation, every entity remains unique, ensuring that no two minds are ever identical.

Though his career included government service and a brief period of retirement in Hengqu, his intellectual legacy was solidified posthumously. His most significant work, Correcting Ignorance, became a cornerstone of Neo-Confucian thought. Much of his influence was later curated by scholars like Zhu Xi and the Cheng brothers, who helped preserve his ideas. Zhang’s commitment to the intellectual goals of his time—such as preserving ancient wisdom and fostering peace—ensured his enshrinement in the Confucian temple in 1241 CE, long after his death on the road in 1077 CE.

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