What is a Jing?
/Sometimes when a Chinese teacher is trying to explain a term they will instead explain a term which is a homonym. Because there are so many words in Chinese which sound alike, simular sounding words can, over hundereds of years, take on parallel or related meanings and so in this chapter, instead of explaining jing, the solid, more structural or dense aspect of Qi, I will instead explain jing, a classic.
The term jing (ching) is usually translated: Classic. "...(It) is the underlying structure, both in the human body, such as the meridians of acupuncture, and in the body of knowledge of a civilization. This is the general name given to all the "master texts," such as the Tao-te ching, ... [or the I Ching (Yijing)]. It can be used to describe books that are not philosophical (e.g. Nei Ching, "The internal Classic," the master text of Chinese medicine) or even Chinese (e.g. Shen Ching, "The Holy Classic," the Bible). The literal meaning of this character is "warpage" (the threads stretched out lengthwise in a loom that give structure to the fabric that is woven),...." (Cyrille Javary, Understanding the I Ching, p. xii.)

The classical version of traditional literature uses very dense concentrated metaphorical and symbolic language to describe a topic. Often it is a consolidation of many earlier texts which have made mention of the topic at hand. These concentrated classics are committed to memory. Understanding is expected to come over an extended period of time, with experience. In some ways this is a good summary of what a Taijiquan form or a qigng movement series is in itself.
Out of this literary tradition grew a tradition of commentary and explanation, probably the consolidation of many generation of practitioners notes from the margins of their copies of the original classic. A popular way to begin a study of a classic, or jing, is for the teacher to take only the first character of the text and from just that character, reconstruct the essence, or "view" of the entire text. Commentaries which really pull apart or expand the meanings of a classic text tend to read like overwhelming layers of wafting clouds passing through the reader; too much to actually grasp, likely to invoke sleep, an inventory of embedded meanings meant to have an influence over time.
Studying Internal arts is something like memorizing a classic (jing). A classic, like a an Internal arts routine, embodies conservation, efficiency and the unfolding of the totality of previous experience in a concentrated form. In both cases the relationship of student to practice and student to teacher is the processes of unfolding and revealing the text or form and then re-embodying it in its concentrated efficiency.

The practice of Push-hand is analogous to the senario where two scholars are spontaneously exchanging quotes from classic texts while discussing a third topic.