Zhang Zai’s Theory of Vital Energy

Zhang Zai 張載 (1020–1077), one of the so-called Five Masters of the (Northern)
Song period,1 has long been regarded as a forerunner of Learning of the Way
(daoxue 道學) movement. He lived at a time when Lao-Zhuang Daoism, Huayan
Buddhism, and Confucian thought interacted, competed, and were integrated.
Confucian intellectuals attempted to revive classical Confucian thought within
these vibrant cultural and historical conditions. In particular, Confucians faced
strong criticisms from Huayan Buddhism, which enjoyed wide social popularity.
Consequently, Confucians took a profound interest in cosmological, ontological,
and metaphysical questions, all for the sake of responding effectively to the
challenges posed by Buddhist beliefs. ZHANG Zai’s philosophical work can best
be understood within this broader context. Although ZHANG Zai’s philosophy
contains a wealth of ideas, two issues stand out most important: the relationship between the Ultimate Void (taixu 太虛) and qi (氣); and the relationship between heaven as a moral authority and human beings as transformative moral agents, analyzed through an integrated account of human nature. Both of these issues center on the discussion of qi and help to illuminate one of the fundamental philosophical problems in the Chinese tradition, namely the connection between condition/state (ti 體) and function/application (yong 用).