Definition
References to concepts analogous to the qi taken to be the life-process or flow of energy that sustains living beings are found in many belief systems, especially in Asia. Philosophical conceptions of qi from the earliest records of Chinese philosophy (5th century BCE) correspond to Western notions of humours and the ancient Hindu yogic concept of prana, meaning "life force" in Sanskrit. The earliest description of "force" in the current sense of vital energy is found in the Vedas of ancient India (circa 1500–1000 BCE), and from the writings of the Chinese philosopher Mencius (4th century BCE). Historically, it is the Huangdi Neijing translated as, The Yellow Emperor's Classic of Medicine (circa 2nd century BCE) that is credited with first establishing the pathways through which qi circulates in the human body.
| “ | Within the framework of Chinese thought, no notion may attain such a degree of abstraction from empirical data as to correspond perfectly to one of our modern universal concepts. Nevertheless, the term qi comes as close as possible to constituting a generic designation equivalent to our word "energy". When Chinese thinkers are unwilling or unable to fix the quality of an energetic phenomenon, the character qi (氣) inevitably flows from their brushes. | ” |
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—Manfred Porkert, |
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The ancient Chinese described it as "life force". They believed qi permeated everything and linked their surroundings together. They likened it to the flow of energy around and through the body, forming a cohesive and functioning unit. By understanding its rhythm and flow they believed they could guide exercises and treatments to provide stability and longevity.
Although the concept of qi has been important within many Chinese philosophies, over the centuries the descriptions of qi have varied and have sometimes been in conflict. Until China came into contact with Western scientific and philosophical ideas, they had not categorized all things in terms of matter and energy. Qi and li (理, li, pattern) were 'fundamental' categories similar to matter and energy.
Fairly early on, some Chinese thinkers began to believe that there were different fractions of qi and that the coarsest and heaviest fractions of qi formed solids, lighter fractions formed liquids, and the most ethereal fractions were the "lifebreath" that animates living beings.
Yuán qì is a notion of innate or pre-natal qi to distinguish it from acquired qi that a person may develop over the course of their lifetime.
Read more about this topic: Qi
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