409. (11) Love or the will does nothing except in conjunction with wisdom
or the understanding. For as love has no sensitive nor any active life
apart from the understanding; and as love introduces the understanding
into all things of the mind (as was shown above, n. 407, 408), it follows
that love or the will does nothing except in conjunction with the
understanding. For what is it to act from love without the understanding?
Such action can only be called irrational; for the understanding teaches
what ought to be done and how it ought to be done. Apart from the
understanding love does not know this; consequently such is the marriage
between love and the understanding, that although they are two, they act
as one. There is a like marriage between good and truth, for good is of
love and truth is of the understanding. In every particular thing of the
universe as created by the Lord there is such a marriage, their use
having relation to good, and the form of their use to truth. From this
marriage it is that in each and every thing of the body there is a right
and a left, the right having relation to the good from which truth
proceeds, and the left to truth from good, thus to their conjunction.
From this it is that there are pairs in man; there are two brains, two
hemispheres of the brain, two ventricles of the heart, two lobes of the
lungs, two eyes, ears, nostrils, arms, hands, loins, feet, kidneys,
testicles, etc.; and where there are not pairs, there is a right and a
left side, all this for the reason that good looks to truth that it may
take form, and truth looks to good that it may have being. It is the same
in the angelic heavens and in their several societies. On this subject
more may be seen above (n. 401), where it is shown that love or the will
is unable to effect anything by its human form without a marriage with
wisdom or the understanding. Conjunction of evil and falsity, which is
opposite to the conjunction of good and truth, will be spoken of elsewhere.

410. (12) Love or the will conjoins itself to wisdom or the understanding,
and causes wisdom or the understanding to be reciprocally conjoined to it.
That love or the will conjoins itself to wisdom or the understanding is
plain from their correspondence with the heart and lungs. Anatomical
observation shows that the heart is in its life's motion when the lungs
are not yet in motion; this it shows by cases of swooning and of
suffocation, also by the fetus in