417. Now as love corresponds to the heart, and the understanding to the lungs, the foregoing statements may be corroborated by their correspondence; as, for instance, how the understanding can be elevated above its own love even into wisdom; and how, if that love is merely natural, the understanding is drawn down by it from that elevation. Man has a twofold respiration; one of the body, the other of the spirit. These two respirations may be separated and they may be conjoined; with men merely natural, especially with hypocrites, they are separated, but rarely with men who are spiritual and sincere. Consequently a merely natural man and hypocrite, whose understanding has been elevated, and in whose memory therefore various things of wisdom remain, can talk wisely in company by thought from the memory; but when not in company, he does not think from the memory, but from his spirit, thus from his love. He also respires in like manner, inasmuch as thought and respiration act correspondently. That the structure of the lungs is such that they can respire both by blood from the heart and by blood from outside of the heart has been shown above.

418. It is the common opinion that wisdom makes the man; therefore when any one is heard to talk and teach wisely he is believed to be wise; yea, he himself believes it at the time, because when he talks or teaches in company he thinks from the memory, and if he is a merely natural man, from the surface of his love, which is a desire for honor, glory, and gain; but when the same man is alone he thinks from the more inward love of his spirit, and then not wisely, but sometimes insanely. From all this it can be seen that no one is to be judged of by wise speaking, but by his life; that is, not by wise speaking separate from life, but by wise speaking conjoined to life. By life is meant love. That love is the life has been shown above.

419. (16) Love or the will is purified in the understanding, if they are elevated together. From birth man loves nothing but self and the world, for nothing else appears before his eyes, consequently nothing else occupies his mind. This love is corporeal-natural, and may be called material love. Moreover, this love has become impure by reason of the separation of heavenly love from it in parents. This love could not be separated from its impurity unless man had a power to raise his understanding into the light of heaven, and to see how he ought to live in order that his love, as well as his understanding, may be elevated into wisdom. By means of the understanding, love, that is, the man, sees what the evils are that defile and corrupt the love; he also sees that if he flees from those evils as sins and turns away from them, he loves the things that are opposite to those evils; all of which are heavenly. Then also he perceives the means by which he is enabled to flee from and turn away from those evils as sins. This the love, that is, the man, sees, by the exercise of his power to elevate his understanding into the light of heaven, which is the source of wisdom. Then so far as love gives heaven the first place and the world the second, and at the same time gives the Lord the first place and self the second, so far love is purged of its uncleanness and is purified; in other words, is raised into the heat of heaven, and conjoined with the light of heaven in which the understanding is; and the marriage takes place that is called the marriage of good and truth, that is, of love and wisdom. Any one can comprehend intellectually and see rationally, that so far as he flees from and turns away from theft and cheating, so far he loves sincerity, rectitude and justice; so far as he flees and turns away from revenge and hatred, so far he loves the neighbor; and so far as he flees and turns away from adulteries, so far he loves chastity; and so on. And yet scarcely any one knows what there is of heaven and the Lord in sincerity, rectitude, justice, love towards the neighbor, chastity, and other affections of heavenly love, until he has removed their opposites. When he has removed the opposites, then he is in those affections, and therefrom recognizes and sees them. Previously there is a kind of veil interposed, that does, indeed, transmit to love the light of heaven; yet inasmuch as the love does not in that degree love its consort, wisdom, it does not receive it, yea, may even contradict and rebuke it when it returns from its elevation. Still man flatters himself that the wisdom of his understanding may be made serviceable as a means to honor, glory, or gain. Then man gives self and the world the first place, and the Lord and heaven the second, and what has the second place is loved only so far as it is serviceable, and if it is not serviceable it is disowned and rejected; if not before death, then after it. From all this the truth is now evident, that love or the will is purified in the understanding if they are elevated together.

420. The same thing is imaged in the lungs, whose arteries and veins correspond to the affections of love, and whose respirations correspond to the perceptions and thoughts of the understanding, as has been said above. That the heart's blood is purified of undigested matters in the lungs, and nourishes itself with suitable food from the inhaled air, is evident from much observation. (1) That the blood is purified of undigested matter in the lungs, is evident not only from the influent blood, which is venous, and therefore filled with the chyle collected from food and drink, but also from the moisture of the outgoing breath and from its odor as perceived by others, as well as from the diminished quantity of the blood flowing back into the left ventricle of the heart. (2) That the blood nourishes itself with suitable food from the inhaled air is evident from the immense volumes of odors and exhalations continually flowing forth from fields, gardens, and woods; from the immense supply of salts of various kinds in the water that rises from the ground and from rivers and ponds, and from the immense quantity of exhalations and effluvia from human beings and animals with which the air is impregnated. That these things flow into the lungs with the inhaled air is undeniable: it is therefore undeniable also that from them the blood draws such things as are useful to it; and such things are useful as correspond to the affections of its love. For this reason there are, in the vesicles or innermost recesses of the lungs, little veins in great abundance with tiny mouths that absorb these suitable matters; consequently, the blood that flows back into the left ventricle of the heart is changed into arterial blood of brilliant hue. These facts prove that the blood purifies itself of heterogeneous things and nourishes itself with homogeneous things. That the blood in the lungs purifies and nourishes itself correspondently to the affections of the mind is as yet unknown; but in the spiritual world it is very well known, for angels in the heavens find delight only in the odors that correspond to the love of their wisdom, while the spirits in hell find delight only in the odors that correspond to a love opposed to wisdom; these are foul odors, but the former are fragrant. It follows that men in the world impregnate their blood with similar things according to correspondence with the affections of their love; for what the spirit of a man loves, his blood according to correspondence craves and by respiration attracts. From this correspondence it results that man as regards his love is purified if he loves wisdom, and is defiled if he does not love it. Moreover, all purification of man is effected by means of the truths of wisdom, and all pollution of man is effected by means of falsities that are opposite to the truths of wisdom.

421. (17) Love or the will is defiled in the understanding and by it, if they are not elevated together. This is because love, if not elevated, remains impure (as stated above, n. 419, 420); and while it remains impure it loves what is impure, such as revenges, hatreds, deceits, blasphemes, adulteries, for these are then its affections that are called lusts, and it rejects what belongs to charity, justice, sincerity, truth, and chastity. Love is said to be defiled in the understanding, and by it; in the understanding, when love is affected by these impure things; by the understanding, when love makes the things of wisdom to become its servants, and still more when it perverts, falsifies, and adulterates them. Of the corresponding state of the heart, or of its blood in the lungs, there is no need to say more than has been said above (n. 420), except that instead of the purification of the blood its defilement takes place; and instead of the nutrition of the blood by fragrant odors its nutrition is effected by stenches, precisely as it is respectively in heaven and in hell.

422. (18) Love, when purified by wisdom in the understanding, becomes spiritual and celestial. Man is born natural, but in the measure in which his understanding is raised into the light of heaven, and his love conjointly is raised into the heat of heaven, he becomes spiritual and celestial; he then becomes like a garden of Eden, which is at once in vernal light and vernal heat. It is not the understanding that becomes spiritual and celestial, but the love; and when the love has so become, it makes its consort, the understanding, spiritual and celestial. Love becomes spiritual and celestial by a life according to the truths of wisdom which the understanding teaches and requires. Love imbibes these truths by means of its understanding, and not from itself; for love cannot elevate itself unless it knows truths, and these it can learn only by means of an elevated and enlightened understanding; and then so far as it loves truths in the practice of them so far it is elevated; for to understand is one thing and to will is another; or to say is one thing and to do is another. There are those who understand and talk about the truths of wisdom, yet neither will nor practise them. When, therefore, love puts in practice the truths of light which it understands and speaks, it is elevated. This one can see from reason alone; for what kind of a man is he who understands the truths of wisdom and talks about them while he lives contrary to them, that is, while his will and conduct are opposed to them? Love purified by wisdom becomes spiritual and celestial, for the reason that man has three degrees of life, called natural, spiritual, and celestial (of which in the Third Part of this work), and he is capable of elevation from one degree into another. Yet he is not elevated by wisdom alone, but by a life according to wisdom, for a man's life is his love. Consequently, so far as his life is according to wisdom, so far he loves wisdom; and his life is so far according to wisdom as he purifies himself from uncleannesses, which are sins; and so far as he does this does he love wisdom.

423. That love purified by the wisdom in the understanding becomes spiritual and celestial cannot be seen so clearly by their correspondence with the heart and lungs, because no one can see the quality of the blood by which the lungs are kept in their state of respiration. The blood may abound in impurities, and yet not be distinguishable from pure blood. Moreover, the respiration of a merely natural man appears the same as the respiration of a spiritual man. But the difference is clearly discerned in heaven, for there every one respires according to the marriage of love and wisdom; therefore as angels are recognized according to that marriage, so are they recognized according to their respiration. For this reason it is that when one who is not in that marriage enters heaven, he is seized with anguish in the breast, and struggles for breath like a man in the agonies of death; such persons, therefore throw themselves headlong from the place, nor do they find rest until they are among those who are in a respiration similar to their own; for then by correspondence they are in similar affection, and therefore in similar thought. From all this it can be seen that with the spiritual man it is the purer blood, called by some the animal spirit, which is purified; and that it is purified so far as the man is in the marriage of love and wisdom. It is this purer blood which corresponds most nearly to that marriage; and because this blood inflows into the blood of the body, it follows that the latter blood is also purified by means of it. The reverse is true of those in whom love is defiled in the understanding. But, as was said, no one can test this by any experiment on the blood; but he can by observing the affections of love, since these correspond to the blood.

424. (19) Love, when defiled in the understanding and by it, becomes natural, sensual, and corporeal. Natural love separated from spiritual love is the opposite of spiritual love; because natural love is love of self and of the world, and spiritual love is love to the Lord and love to the neighbor; and love of self and the world looks downward and outward, and love to the Lord looks upward and inward. Consequently when natural love is separated from spiritual love it cannot be elevated above what is man's own, but remains immersed in it, and so far as it loves it, is glued to it. Then if the understanding ascends, and sees by the light of heaven such things as are of wisdom, this natural love draws down such wisdom, and joins her to itself in what is its own; and there either rejects the things of wisdom or falsifies them or encircles itself with them, that it may talk about them for reputation's sake. As natural love can ascend by degrees and become spiritual and celestial, in the same way it can descend by degrees and become sensual and corporeal, and it does descend so far as it loves dominion from no love of use, but solely from love of self. It is this love which is called the devil. Those who are in this love are able to speak and act in the same manner as those who are in spiritual love; but they do this either from memory or from the understanding elevated by itself into the light of heaven. Nevertheless, what they say and do is comparatively like fruit that appears beautiful on the surface but is wholly rotten within; or like almonds which from the shell appear sound but are wholly worm-eaten within. These things in the spiritual world are called fantasies, and by means of them harlots, there called sirens, make themselves appear handsome, and adorn themselves with beautiful garments; but when the fantasy is dissipated the sirens appear like ghosts, and are like devils who make themselves angels of light. For when that corporeal love draws its understanding down from its elevation, as it does when man is alone and thinks from his own love, then he thinks against God in favor of nature, against heaven in favor of the world, and against the truths and goods of the church in favor of the falsities and evils of hell; thus against wisdom. From this the character of those who are called corporeal men can be seen: for they are not corporeal in understanding, but corporeal in love; that is, they are not corporeal in understanding when they converse in company, but are so when they hold converse with themselves in spirit; and being such in spirit, therefore after death they become, both in love and in understanding, spirits that are called corporeal. Those who in the world had been in a supreme love of ruling from the love of self, and had also surpassed others in elevation of understanding, then appear in body like Egyptian mummies, and in mind gross and silly. Who in the world at the present day is aware that this love in itself is of such a nature? Yet a love of ruling from love of use is possible, but only from love of use for the sake of the common good, not for the sake of self. It is difficult, however, for man to distinguish the one love from the other, although the difference between them is like that between heaven and hell. The differences between these two loves of ruling may be seen in the work on Heaven and Hell (n. 551-565).

425. (20) The capacity to understand called rationality and the capacity to act called freedom, still remain. These two capacities belonging to man have been treated of above (n. 264-267). Man has these two capacities that he may from being natural become spiritual, that is, may be regenerated. For, as was said above, it is man's love that becomes spiritual, and is regenerated; and it cannot become spiritual or be regenerated unless it knows, by means of its understanding, what evil is and what good is, and therefore what truth is and what falsity is. When it knows this it can choose either one or the other; and if it chooses good it can, by means of its understanding, be instructed about the means by which to attain to good. All the means by which man is enabled to attain good are provided. It is by rationality that man is able to know and understand these means, and by freedom that he is able to will and to do them. There is also a freedom to will to know, to understand, and to think these means. Those who hold from church doctrine that things spiritual or theological transcend the understanding, and are therefore to be believed apart from the understanding know nothing of these capacities called rationality and freedom. These cannot do otherwise than deny that there is a capacity called rationality. Those, too, who hold from church doctrine that no one is able to do good from himself, and consequently that good is not to be done from any will to be saved, cannot do otherwise than deny, from a principle of religion, the existence of both these capacities which belong to man. Therefore, those who have confirmed themselves in these things, after death, in agreement with their faith, are deprived of both these capacities; and in place of heavenly freedom, in which they might have been, are in infernal freedom, and in place of angelic wisdom from rationality, in which they might have been, are in infernal insanity; and what is wonderful, they claim that both these capacities have place in doing what is evil and thinking what is false, not knowing that the exercise of freedom in doing what is evil is slavery, and that the exercise of the reason to think what is false is irrational. But it is to be carefully noted that these capacities, freedom and rationality, are neither of them man's, but are of the Lord in man, and that they cannot be appropriated to man as his; nor indeed, can they be given to man as his, but are continually of the Lord in man, and yet are never taken away from man; and this because without them man cannot be saved, for without them he cannot be regenerated (as has been said above). For this reason man is instructed by the church that from himself he can neither think what is true nor do what is good. But inasmuch as man perceives no otherwise than that he thinks from himself what is true and does from himself what is good, it is very evident that he ought to believe that he thinks as if from himself what is true, and does as if from himself what is good. For if he does not believe this, either he does not think what is true nor do what is good, and therefore has no religion, or he thinks what is true and does what is good from himself, and thus ascribes to himself that which is Divine. That man ought to think what is true and do good as if from himself, may be seen in the Doctrine of Life for the New Jerusalem, from beginning to end.

426. (21) Spiritual and celestial love is love toward the neighbor and love to the Lord; and natural and sensual love is love of the world and love of self. By love toward the neighbor is meant the love of uses, and by love to the Lord is meant the love of doing uses (as has been shown before). These loves are spiritual and celestial, because loving uses and doing them from a love of them, is distinct from the love of what is man's own; for whoever loves uses spiritually looks not to self, but to others outside of self for whose good he is moved. Opposed to these loves are the loves of self and of the world, for these look to uses not for the sake of others but for the sake of self; and those who do this invert Divine order, and put self in the Lord's place, and the world in the place of heaven; as a consequence they look backward, away from the Lord and away from heaven, and looking backward away from these is looking to hell. (More about these loves may be seen above, n. 424.) Yet man does not feel and perceive the love of performing uses for the sake of uses as he feels and perceives the love of performing uses for the sake of self; consequently when he is performing uses he does not know whether he is doing them for the sake of uses or for the sake of self. But let him know that he is performing uses for the sake of uses in the measure in which he flees from evils; for so far as he flees from evils, he performs uses not for himself, but from the Lord. For evil and good are opposites; so far as one is not in evil he is in good. No one can be in evil and in good at the same time, because no one can serve two masters at the same time. All this has been said to show that although man does not sensibly perceive whether the uses which he performs are for the sake of use or for the sake of self, that is, whether the uses are spiritual or merely natural, still he can know it by this, whether or not he considers evils to be sins. If he regards them as sins, and for that reason abstains from doing them, the uses which he does are spiritual. And when one who does this flees from sins from a feeling of aversion, he then begins to have a sensible perception of the love of uses for the sake of uses, and this from spiritual enjoyment in them.