“Seth material” search engine (Jane Roberts)

The body maintains its vitality not only through the physical motion and agility that you perceive, but by microscopic agility, and actions within microseconds, that you do not perceive. There is as much motion, stimulation, and reaction in the interior bodily environment as the body meets through its encounters with the exterior environment. The body must now and then “flush its systems out,” run through its repertoire, raise its temperature (pause), activate its hormonal actions more strongly. In such ways it keeps its system of immunities clear. That system operates always. To some extent, it is a way that the body distinguishes between self and nonself.

(Pause at 9:17.) There are all kinds of biological reactions between bodies that go unnoticed, and they are all basically of a social nature, dealing with biological communications. In a fashion viruses—in a fashion—again, are a way of dealing with or controlling the environment. These are natural interactions, and since you live in a world where, overall, people are healthy enough to contribute through labor, energy, and ideas, health is the dominating ingredient—but there are biological interactions between all physical bodies that are the basis for that health, and the mechanisms include the interactions of viruses, and even the periods of indisposition, that are not understood.