The practical content of hexagram 52 is not stillness in general but stillness that is correctly located, and the body sequence is what conveys it.
Stopping at the toes, before movement begins, is easy and is called blameless. Stopping at the calves, when the legs are already moving and the trunk is not, is called unhappy, the person cannot rescue the one they follow. Stopping at the hips, with the spine forced rigid, is dangerous. The higher the stopping point, the harder it is, and the more likely it is to be a matter of holding still under strain rather than of not having started.
That gradation makes the hexagram a question rather than an instruction. Where in the movement has the querent got to, and is stopping still available at low cost? The answer determines whether the figure counsels an easy pause or a difficult restraint.
The fifth line, about the jaws and words having order, is the one readers find most immediately applicable. Stillness at the level of speech is the specific discipline of not saying the thing, and the text treats it as achievable and as producing the disappearance of remorse.
The counterpart figure is hexagram 51, Thunder, its exact inversion. Where that one describes composure during an event, this one describes knowing when not to begin. Between them they cover the two halves of the question, and the King Wen sequence places them adjacently for that reason. Neither figure recommends its own principle absolutely; each is the answer to a different position in the same problem.