to make clear that there are two kinds of heat,
spiritual heat and natural heat; and that spiritual heat is from the
sun of heaven and natural heat from the sun of the world, and that
influx and consequent cooperation produce the effects that appear
before the eyes in the world.{1}

{Footnote 1} There is an influx from the spiritual world into
the natural world (n. 6053-6058, 6189-6215, 6307-6327,
6466-6495, 6598-6626). There is also an influx into the lives
of animals (n. 5850). And into the subjects of the vegetable
kingdom (n. 3648). This influx is a continual endeavor to act
in accordance with the Divine order (n. 6211 at the end).

568. Spiritual heat in man is the heat of his life, because, as was
said above, it is in its essence love. This heat is what is meant in
the Word by "fire," love to the Lord and love towards the neighbor by
"heavenly fire," and love of self and love of the world by "infernal
fire."

569. Infernal fire or love springs from a like origin as heavenly
fire or love, namely, the sun of heaven, or the Lord; but it is made
infernal by those who receive it. For all influx from the spiritual
world varies in accordance with reception, that is, in accordance
with the forms into which it flows, just as it is with the heat and
light from the sun of the world. The heat from that sun flowing into
shrubberies and beds of flowers produces vegetation, and draws forth
grateful and sweet odors; but the same heat flowing into
excrementitious and decaying substances produces putrefactions, and
draws forth rank and disgusting stenches. In like manner the light
from the same sun produces in one subject beautiful and pleasing
colors, in another unbeautiful and disagreeable colors. The same is
true of the heat and light from the sun of heaven, which is love.
When the heat, or love, from that sun flows into good, as it does in
good men and angels, it makes their good fruitful; but when it flows
into the evil it produces a contrary effect, for their evils either
suffocate it or pervert it. In like manner when the light of heaven
flows into the truths of good it imparts intelligence and wisdom; but
when it flows into the falsities of evil it is turned into insanities
and phantasies of various kinds. Thus in every instance the result is
in accordance with reception.

570. As infernal fire is the love of self and of the world it is also
every lust of these loves, since lust is love in its continu