out from them by two ways.
This enables the lungs to respire non-synchronously with the heart. That
the alternate movements of the heart and the alternate movements of the
lungs do not act as one is well known. Now, inasmuch as there is a
correspondence of the heart and lungs with the will and understanding
(as shown above), and inasmuch as conjunction by correspondence is of
such a nature that as one acts so does the other, it can be seen by the
flow of the blood out of the heart into the lungs how the will flows into
the understanding, and produces the results mentioned just above (n. 404)
respecting affection for and perception of truth, and respecting thought.
By correspondence this and many other things relating to the subject,
which cannot be explained in a few words, have been disclosed to me.
Whereas love or the will corresponds to the heart, and wisdom or the
understanding to the lungs, it follows that the blood vessels of the
heart in the lungs correspond to affections for truth, and the
ramifications of the bronchia of the lungs to perceptions and thoughts
from those affections. Whoever will trace out all the tissues of the
lungs from these origins, and disclose the analogy with the love of the
will and the wisdom of the understanding, will be able to see in a kind
of image the things mentioned above (n. 404), and thereby attain to a
confirmed belief. But since a few only are familiar with the anatomical
details respecting the heart and lungs, and since confirming a thing by
what is unfamiliar induces obscurity, I omit further demonstration of
the analogy.

406. (9) Through these three conjunctions love or the will is in its
sensitive life and in its active life. Love without the understanding,
or affection which is of love without thought, which is of the
understanding, can neither feel nor act in the body; since love without
the understanding is as it were blind, and affection without thought is
as it were in thick darkness, for the understanding is the light by which
love sees. The wisdom of the understanding, moreover, is from the light
that proceeds from the Lord as a sun. Since, then, the will's love,
without the light of the understanding, sees nothing and is blind, it
follows that without the light of the understanding even the bodily
senses would be blind and blunted, not only sight and hearing, but the
other senses also, - the other senses, because all perception of truth
is a property of love in t