379. It is known that there is vital heat in man and in every living creature; but its origin is not known. Every one speaks of it from conjecture, consequently such as have known nothing of the correspondence of natural things with spiritual have ascribed its origin, some to the sun's heat, some to the activity of the parts, some to life itself; but as they have not known what life is, they have been content with the mere phrase. But any one who knows that there is a correspondence of love and its affections with the heart and its derivations may know that the origin of vital heat is love. For love goes forth as heat from the spiritual sun where the Lord is, and moreover is felt as heat by the angels. This spiritual heat which in its essence is love, is what inflows by correspondence into the heart and its blood, and imparts heat to it, and at the same time vivifies it. That a man grows hot, and, as it were, is fired, according to his love and the degree of it, and grows torpid and cold according to its decrease, is known, for it is felt and seen; it is felt by the heat throughout the body, and seen by the flushing of the face; and on the other hand, extinction of love is felt by coldness in the body, and is seen by paleness in the face. Because love is the life of man, the heart is the first and the last of his life; and because love is the life of man, and the soul maintains its life in the body by means of the blood, in the Word blood is called the soul (Gen. 9:4; Levit. 17:14). The various meanings of soul will be explained in what follows.
380. The redness, also, of the blood is from the correspondence of the heart and the blood with love and its affection; for in the spiritual world there are all kinds of colors, of which red and white are the fundamental, the rest deriving their varieties from these and from their opposites, which are a dusky fire color and black. Red there corresponds to love, and white to wisdom. Red corresponds to love because it originates in the fire of the spiritual sun, and white corresponds to wisdom because it originates in the light of that sun. And because there is a correspondence of love with the heart, the blood must needs be red, and reveal its origin. For this reason in the heavens where love to the Lord reigns the light is flame-colored, and the angels there are clothed in purple garments; and in the heavens where wisdom reigns the light is white, and the angels there are clothed in white linen garments.
381. The heavens are divided into two kingdoms, one called celestial, the other spiritual; in the celestial kingdom love to the Lord reigns, and in the spiritual kingdom wisdom from that love. The kingdom where love reigns is called heaven's cardiac kingdom, the one where wisdom reigns is called its pulmonic kingdom. Be it known, that the whole angelic heaven in its aggregate represents a single man, and before the Lord appears as a single man; consequently its heart makes one kingdom and its lungs another. For there is a general cardiac and pulmonic movement throughout heaven, and a particular movement therefrom in each angel. The general cardiac and pulmonic movement is from the Lord alone, because love and wisdom are from Him alone. For these two movements are in the sun where the Lord is and which is from the Lord, and from that in the angelic heavens and in the universe. Banish spaces and think of omnipresence, and you will be convinced that it is so. That the heavens are divided into two kingdoms, celestial and spiritual, see the work on Heaven and Hell (n. 20-28); and that the whole angelic heaven in the aggregate represents a single man (n. 59-67).
382. (4) The understanding corresponds to the lungs. This follows from what has been said of the correspondence of the will with the heart; for there are two things, will and understanding, which reign in the spiritual man, that is, in the mind, and there are two things, heart and lungs, which reign in the natural man, that is, in the body; and there is correspondence (as was said above) of all things of the mind with all thinks of the body; from which it follows that as the will corresponds to the heart, so the understanding corresponds to the lungs. Moreover, that the understanding corresponds to the lungs any one may observe in himself, both from his thought and from his speech. (1) From thought: No one is able to think except with the concurrence and concordance of the pulmonary respiration; consequently, when he thinks tacitly he breathes tacitly, if he thinks deeply he breathes deeply; he draws in the breath and lets it out, contracts and expands the lungs, slowly or quickly, eagerly, gently, or intently, all in conformity to his thought, thus to the influx of affection from love; yea, if he hold the breath entirely he is unable to think, except in his spirit by its respiration, which is not manifestly perceived. (2) From speech: Since not the least vocal sound flows forth from the mouth without the concurrent aid of the lungs, - for the sound, which is articulated into words, all comes forth from the lungs through the trachea and epiglottis, - therefore, according to the inflation of these bellows and the opening of the passage the voice is raised even to a shout, and according to their contraction it is lowered; and if the passage is entirely closed speech ceases and thought with it.
383. Since the understanding corresponds to the lungs and thought therefrom to the respiration of the lungs, in the Word, "soul" and "spirit" signify the understanding; for example:
Thou shalt love the Lord thy God with all thy heart and with all thy soul (Matt. 22:37).
God will give a new heart and a new spirit (Ezek. 36:26; Psalm 51:10).
That "heart" signifies the love of the will was shown above; therefore "soul" and "spirit" signify the wisdom of the understanding. That the spirit of God, also called the Holy Spirit, means Divine Wisdom, and therefore Divine Truth which is the light of men, may be seen in The Doctrine of the New Jerusalem concerning the Lord (n. 50, 51), therefore,
The Lord breathed on His disciples, and said, Receive ye the Holy
Spirit (John 20:22);
for the same reason it is said that: