59-72) and that
all things in man correspond to the heavens (n. 87-102). How
incomprehensible and inexplicable that form is is evident only in a
general way from the nervous fibers, by which each part and all parts
of the body are woven together. What these fibers are, and how they
proceed and flow in the brain, the eye cannot at all perceive; for
innumerable fibers are there so interwoven that taken together they
appear like a soft continuous mass; and yet it is in accord with
these that each thing and all things of the will and understanding
flow with the utmost distinctness into acts. How again they
interweave themselves in the body is clear from the various plexuses,
such as those of the heart, the mesentery, and others; and also from
the knots called ganglions, into which many fibers enter from every
region and there intermingle, and when variously joined together go
forth to their functions, and this again and again; besides like
things in every viscus, member, organ, and muscle. Whoever examines
these fibers and their many wonders with the eye of wisdom will be
utterly bewildered. And yet the things seen with the eye are few, and
those not seen are still more wonderful because they belong to an
inner realm of nature.
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