407. That this is so can be proved to the life by the conjunction of the heart with the lungs, because the correspondence between the will and the heart, and between the understanding and the lungs, is such that just as the love acts with the understanding spiritually, so does the heart act with the lungs naturally: from this, what has been said above can be seen as in an image presented to the eye. That man has neither any sensitive life nor any active life, so long as the heart and the lungs do not act together, is evident from the state of the fetus or the infant in the womb, and from its state after birth. So long as man is a fetus, that is, in the womb, the lungs are closed, wherefore he has no feeling nor any action; the organs of sense are closed up, the hands are bound, likewise the feet; but after birth the lungs are opened, and as they are opened man feels and acts; the lungs are opened by means of the blood sent into them from the heart. That man has neither sensitive life nor active life without the co-operation of the heart and the lungs, is evident also in swoons, when the heart alone acts, and not the lungs, for respiration then ceases; in this case there is no sensation and no action, as is well known. It is the same with persons suffocated, either by water or by anything obstructing the larynx and closing the respiratory passage; it is well-known that the man then appears to be dead, he feels nothing and does nothing; and yet he is alive in the heart; for he returns to both his sensitive and his active life as soon as the obstructions to the lungs are removed. The blood, it is true, circulates in the meantime through the lungs, but through the pulmonary arteries and veins, not through the bronchial arteries and veins, and these last are what give man the power of breathing. It is the same with the influx of love into the understanding.

408. (10) Love or the will introduces wisdom or the understanding into all things of its house. By the house of love or the will is meant the whole man as to all things of his mind; and as these correspond to all things of the body (as shown above), by the house is meant also the whole man as to all things of his body, called members, organs, and viscera. That the lungs are introduced into all these things just as the understanding is introduced into all things of the mind, can be seen from what has been shown above, namely, that love or the will prepares a house or bridal chamber for its future wife, which is wisdom or the understanding (n. 402); and that love or the will prepares all things in its own human form, that is, in its house, that it may act conjointly with wisdom or the understanding (n. 403). From what is there said, it is evident that each and all things in the whole body are so connected by ligaments issuing from the ribs, vertebrae, sternum, and diaphragm, and from the peritonaeum which depends on these, that when the lungs respire all are likewise drawn and borne along in alternate movements. Anatomy shows that the alternate waves of respiration even enter into the very viscera to their inmost recesses; for the ligaments above mentioned cleave to the sheaths of the viscera, and these sheaths, by their extensions, penetrate to their innermost parts, as do the arteries and veins also by their ramifications. From this it is evident that the respiration of the lungs is in entire conjunction with the heart in each and every thing of the body; and in order that the conjunction may be complete in every respect, even the heart itself is in pulmonic motion, for it lies in the bosom of the lungs and is connected with them by the auricles, and reclines upon the diaphragm, whereby its arteries also participate in the pulmonic motion. The stomach, too, is in similar conjunction with the lungs, by the coherence of its oesophagus with the trachea. These anatomical facts are adduced to show what kind of a conjunction there is of love or the will with wisdom or the understanding, and how the two in consort are conjoined with all things of the mind; for the spiritual and the bodily conjunction are similar.

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 the womb and the chick in the egg. Anatomical observation shows also that the heart, while acting alone, forms the lungs and so adjusts them that it may carry on respiration in them; also that it so forms the other viscera and organs that it may carry on various uses in them, the organs of the face that it may have sensation, the organs of motion that it may act, and the remaining parts of the body that it may exhibit uses corresponding to the affections of love. From all this it can now for the first time be shown that as the heart produces such things for the sake of the various functions which it is afterwards to discharge in the body, so love, in its receptacle called the will, produces like things for the sake of the various affections that constitute its form, which is the human form (as was shown above). Now as the first and nearest of love's affections are affection for knowing, affection for understanding, and affection for seeing what it knows and understands, it follows, that for these affections love forms the understanding and actually enters into them when it begins to feel and to act and to think. To this the understanding contributes nothing, as is evident from the analogy of the heart and lungs (of which above). From all this it can be seen, that love or the will conjoins itself to wisdom or the understanding, and not wisdom or the understanding to love or the will; also from this it is evident that knowledge, which love acquires to itself by the affection for knowing, and perception of truth, which it acquires by the affection for understanding, and thought which it acquires by the affection for seeing what it knows and understands, are not of the understanding but of love. Thoughts, perceptions, and knowledges therefrom, flow in, it is true, out of the spiritual world, yet they are received not by the understanding but by love, according to its affections in the understanding. It appears as if the understanding received them, and not love or the will, but this is an illusion. It appears also as if the understanding conjoined itself to love or the will, but this too, is an illusion; love or the will conjoins itself to the understanding, and causes the understanding to be reciprocally conjoined to it. This reciprocal conjunction is from love's marriage with wisdom, wherefrom a conjunction seemingly reciprocal, from the life and consequent power of love, is effected. It is the same with the marriage of good and truth; for good is of love and truth is of the understanding. Good does everything and it receives truth into its house and conjoins itself with it so far as the truth is accordant. Good can also admit truths which are not accordant; but this it does from an affection for knowing, for understanding, and for thinking its own things, whilst it has not as yet determined itself to uses, which are its ends and are called its goods. Of reciprocal conjunction, that is, the conjunction of truth with good, there is none whatever. That truth is reciprocally conjoined is from the life belonging to good. From this it is that every man and every spirit and angel is regarded by the Lord according to his love or good, and no one according to his intellect, or his truth separate from love or good. For man's life is his love (as was shown above), and his life is qualified according as he has exalted his affections by means of truth, that is, according as he has perfected his affections by wisdom. For the affections of love are exalted and perfected by means of truths, thus by means of wisdom. Then love acts conjointly with its wisdom, as though from it; but it acts from itself through wisdom, as through its own form, and this derives nothing whatever from the understanding, but everything from a kind of determination of love called affection.

411. All things that favor it love calls its goods, and all things that as means lead to goods it calls its truths; and because these are means they are loved and come to be of its affection and thus become affections in form; therefore truth is nothing else than a form of the affection that is of love. The human form is nothing else than the form of all the affections of love; beauty is its intelligence, which it procures for itself through truths received either by sight or by hearing, external and internal. These are what love disposes into the form of its affections; and these forms exist in great variety; but all derive a likeness from their general form, which is the human. To the love all such forms are beautiful and lovely, but others are unbeautiful and unlovely. From this, again, it is evident that love conjoins itself to the understanding, and not the reverse, and that the reciprocal conjunction is also from love. This is what is meant by love or the will causing wisdom or the understanding to be reciprocally conjoined to it.

412. What has been said may be seen in a kind of image and thus corroborated by the correspondence of the heart with love and of the lungs with the understanding (of which above). For if the heart corresponds to love, its determinations, which are arteries and veins, correspond to affections, and in the lungs to affections for truth; and as there are also other vessels in the lungs called air vessels, whereby respiration is carried on, these vessels correspond to perceptions. It must be distinctly understood that the arteries and veins in the lungs are not affections, and that respirations are not perceptions and thoughts, but that they are correspondences, that is, they act correspondently or synchronously; likewise that the heart and the lungs are not the love and understanding, but correspondences: and inasmuch as they are correspondences the one can be seen in the other. Whoever from anatomy has come to understand the whole structure of the lungs can see clearly, when he compares it with the understanding, that the understanding does not act at all by itself, does not perceive nor think by itself, but acts wholly by affections which are of love. These, in the understanding, are called affection for knowing, for understanding, and for seeing truth (which have been treated of above). For all states of the lungs depend on the blood from the heart and from the vena cava and aorta; and respirations, which take place in the bronchial branches, proceed in accordance with the state of those vessels; for when the flow of the blood stops, respiration stops. Much more may be disclosed by comparing the structure of the lungs with the understanding, to which the lungs correspond; but as few are familiar with anatomical science, and to try to demonstrate or prove anything by what is unknown renders it obscure, it is not well to say more on this subject. By what I know of the structure of the lungs I am fully convinced that love through its affections conjoins itself to the understanding, and that the understanding does not conjoin itself to any affection of love, but that it is reciprocally conjoined by love, to the end that love may have sensitive life and active life. But it must not be forgotten that man has a twofold respiration, one of the spirit and another of the body; and that the respiration of the spirit depends on the fibers from the brains, and the respiration of the body on the blood-vessels from the heart, and from the vena cava and aorta. It is evident, moreover, that thought produces respiration; it is evident, also, that affection, which is of love, produces thought, for thought without affection is precisely like respiration without a heart, a thing impossible. From this it is clear that affection, which is of love, conjoins itself to thought, which is of the understanding (as was said above), in like manner as the heart does in the lungs.

413. (13) Wisdom or the understanding, from the potency given to it by love, can be elevated and can receive such things as are of light out of heaven, and perceive them. That man has the ability to perceive arcana of wisdom when he hears them, has been shown above in many places. This capacity of man is called rationality. It belongs to every man by creation. It is the capacity to understand things interiorly, and to decide what is just and right, and what is good and true; and by it man is distinguished from beasts. This, then, is what is meant when it is said, that the understanding can be elevated and receive things that are of light out of heaven, and perceive them. That this is so can also be seen in a kind of image in the lungs, for the reason that the lungs correspond to the understanding. In the lungs it can be seen from their cellular substance, which consists of bronchial tubes continued down to the minutest air-cells, which are receptacles of air in respirations; these are what the thoughts make one with by correspondence. This cell-like substance is such that it can be expanded and contracted in a twofold mode, in one mode with the heart, in the other almost separate from the heart. In the former, it is expanded and contracted through the pulmonary arteries and veins, which are from the heart alone; in the latter, through the bronchial arteries and veins, which are from the vena cava and aorta, and these vessels are outside of the heart. This takes place in the lungs for the reason that the understanding is capable of being raised above its proper love, which corresponds to the heart, and to receive light from heaven. Still, when the understanding is raised above its proper love, it does not withdraw from it, but derives from it what is called the affection for knowing and understanding, with a view to somewhat of honor, glory, or gain in the world; this clings to every love as a surface, and by it the love shines on the surface; but with the wise, the love shines through. These things respecting the lungs are brought forward to prove that the understanding can be elevated and can receive and perceive things that are of the light of heaven; for the correspondence is plenary. To see from correspondence is to see the lungs from the understanding, and the understanding from the lungs, and thus from both together to perceive proof.

414. (14) Love or the will can in like manner be elevated and can receive such things as are of heat out of heaven provided it loves wisdom, its consort, in that degree. That the understanding can be elevated into the light of heaven, and from that light draw forth wisdom, has been shown in the preceding chapter and in many places above; also that love or the will can be elevated as well, provided it loves those things that are of the light of heaven or that are of wisdom, has also been shown in many places. Yet love or the will cannot be thus elevated through anything of honor, glory, or gain as an end, but only through a love of use, thus not for the sake of self, but for the sake of the neighbor; and because this love is given only by the Lord out of heaven, and is given by the Lord when man flees from evils as sins, therefore it is that love or the will can be elevated by these means, and cannot without these means. But love or the will is elevated into heaven's heat, while the understanding is elevated into its light. When both are elevated, a marriage of the two takes place there, which is called celestial marriage, because it is a marriage of celestial love and wisdom; consequently it is said that love also is elevated if it loves wisdom, its consort, in that degree. The love of wisdom, that is, the genuine love of the human understanding is love towards the neighbor from the Lord. It is the same with light and heat in the world. Light exists without heat and with heat; light is without heat in winter time, and with heat in summer time; and when heat is with light all things flourish. The light with man that corresponds to the light of winter is wisdom without its love; and the light with man that corresponds to the light of summer is wisdom with its love.

415. This conjunction and disjunction of wisdom and love can be seen effigied, as it were, in the conjunction of the lungs with the heart. For the heart can be conjoined to the clustering vesicles of the bronchia by blood sent out from itself, and also by blood sent out not from itself but from the vena cava and the aorta. Thereby the respiration of the body can be separated from the respiration of the spirit; but when blood from the heart alone acts the respirations cannot be separated. Now since thoughts act as one with respirations by correspondence it is plain, from the twofold state of the lungs in respirations, that man is able to think and from thoughts to speak and act in one way when in company with others, and to think and from thought to speak and act in another way when not in company, that is, when he has no fear of loss of reputation; for he can then think and speak against God, the neighbor, the spiritual things of the church, and against moral and civil laws; and he can also act contrary to them, by stealing, by being revengeful, by blaspheming, by committing adultery. But in company with others, where he is afraid of losing reputation, he can talk, preach and act precisely like a spiritual, moral and civil man. From all this it can be seen that love or the will as well as the understanding can be elevated and can receive such things as are of the heat or love of heaven, provided it loves wisdom in that degree, and if it does not love wisdom, that it can as it were be separated.

416. (15) Otherwise love or the will draws down wisdom, or the understanding, from its elevation, that it may act as one with itself. There is natural love and there is spiritual love. A man who is in natural and in spiritual love both at once, is a rational man; but one who is in natural love alone, although able to think rationally, precisely like a spiritual man, is not a rational man; for although he elevates his understanding even to heavenly light, thus to wisdom, yet the things of wisdom, that is, of heavenly light, do not belong to his love. His love, it is true, effects the elevation, but from desire for honor, glory and gain. But when he perceives that he gains nothing of the kind from that elevation (as is the case when he thinks with himself from his own natural love), then he does not love the things of heavenly light or wisdom; consequently he then draws down the understanding from its height, that it may act as one with himself. For example: when the understanding by its elevation is in wisdom, then the love sees what justice is, what sincerity is, what chastity is, even what genuine love is. This the natural love can see by its capacity to understand and contemplate things in heavenly light; it can even talk and preach about these and explain them as at once moral and spiritual virtues. But when the understanding is not elevated, the love, if it is merely natural, does not see these virtues, but instead of justice it sees injustice, instead of sincerity deceit, instead of chastity lewdness, and so on. If it then thinks of the things it spoke of when its understanding was in elevation, it can laugh at them and speak of them merely as serviceable to it in captivating the souls of men. From all this it can be seen how it is to be understood that love, unless it loves wisdom, its consort, in that degree, draws wisdom down from its elevation, that it may act as one with itself. That love is capable of elevation if it loves wisdom in that degree, can be seen above (n. 414).