Qi and li operate together in mutual dependence. They are mutually aspective in all creatures in the universe. These two aspects are manifested in the creation of substantial entities. When their activity is waxing (rapid or expansive), that is the yang energy mode. When their activity is waning (slow or contractive), that is the yin energy mode. The yang and yin phases constantly interact, each gaining and losing dominance over the other. In the process of the waxing and waning, the alternation of these fundamental vibrations, the so called five elements (fire, water, wood, metal, and earth) evolve. Zhu Xi argues that li existed even before Heaven and Earth [8]
In terms of li and qi, Zhu Xi's system strongly resembles Buddhist ideas of li (again, principle) and shi (affairs, matters), though Zhu Xi and his followers strongly argued that they were not copying Buddhist ideas. Instead, they held, they were using concepts already present long before in the I Ching.
Zhu Xi discussed how he saw the Supreme Ultimate concept to be compatible with principle of Taoism, but his concept of Taiji was different from the understanding of Tao in Daoism. Where Taiji is a differentiating principle that results in the emergence of something new, Dao is still and silent, operating to reduce all things to equality and indistinguishability. He argued that there is a central harmony that is not static or empty but was dynamic, and that the Supreme Ultimate is itself in constant creative activity.[edit]Human nature
Zhu Xi considered the earlier Confucian Xun Zi to be a heretic for departing from Mencius' idea of innate human goodness. Even if people displayed immoral behaviour, the supreme regulative principle was good. The cause of immoral actions is qi. Zhu Xi's metaphysics is that everything contains liand qi. Li is the principle that is in everything and governs the universe. Each person has a perfect li. As such, individuals should act in perfect accordance with morality. However, while li is the underlying structure, qi is also part of everything. Qi obscures our perfect moral nature. The task of moral cultivation is to clear our qi. If our qi is clear and balanced, then we will act in a perfectly moral way.[edit]Heart/Mind[edit]Knowledge and action
According to Zhu Xi's epistemology, knowledge and action were indivisible components of truly intelligent activity. Although he did distinguish between the priority of knowing, since intelligent action requires forethought, and the importance of action, as it produces a discernible effect, Zhu Xi said "Knowledge and action always require each other. It is like a person who cannot walk without legs although he has eyes, and who cannot see without eyes although he has legs. With respect to order, knowledge comes first, and with respect to importance, action is more important." [9][edit]The investigation of things and the extension of knowledge
Zhu Xi advocated gewu, the investigation of the things. How to investigate and what these things are is the source of much debate. To Zhu Xi, the things are moral principles and the investigation involves paying attention to everything in both books and affairs[10] because "moral principles are quite inexhaustible".[11][edit]Religion
In terms of li and qi, Zhu Xi's system strongly resembles Buddhist ideas of li (again, principle) and shi (affairs, matters), though Zhu Xi and his followers strongly argued that they were not copying Buddhist ideas. Instead, they held, they were using concepts already present long before in the I Ching.
Zhu Xi discussed how he saw the Supreme Ultimate concept to be compatible with principle of Taoism, but his concept of Taiji was different from the understanding of Tao in Daoism. Where Taiji is a differentiating principle that results in the emergence of something new, Dao is still and silent, operating to reduce all things to equality and indistinguishability. He argued that there is a central harmony that is not static or empty but was dynamic, and that the Supreme Ultimate is itself in constant creative activity.[edit]Human nature
Zhu Xi considered the earlier Confucian Xun Zi to be a heretic for departing from Mencius' idea of innate human goodness. Even if people displayed immoral behaviour, the supreme regulative principle was good. The cause of immoral actions is qi. Zhu Xi's metaphysics is that everything contains liand qi. Li is the principle that is in everything and governs the universe. Each person has a perfect li. As such, individuals should act in perfect accordance with morality. However, while li is the underlying structure, qi is also part of everything. Qi obscures our perfect moral nature. The task of moral cultivation is to clear our qi. If our qi is clear and balanced, then we will act in a perfectly moral way.[edit]Heart/Mind[edit]Knowledge and action
According to Zhu Xi's epistemology, knowledge and action were indivisible components of truly intelligent activity. Although he did distinguish between the priority of knowing, since intelligent action requires forethought, and the importance of action, as it produces a discernible effect, Zhu Xi said "Knowledge and action always require each other. It is like a person who cannot walk without legs although he has eyes, and who cannot see without eyes although he has legs. With respect to order, knowledge comes first, and with respect to importance, action is more important." [9][edit]The investigation of things and the extension of knowledge
Zhu Xi advocated gewu, the investigation of the things. How to investigate and what these things are is the source of much debate. To Zhu Xi, the things are moral principles and the investigation involves paying attention to everything in both books and affairs[10] because "moral principles are quite inexhaustible".[11][edit]Religion
