How profane and thus how much to be detested adulteries are can be seen from the holiness of marriages.  All things in the human body, from the head to the sole of the feet, both interior and exterior, correspond to the heavens, and in consequence man is a heaven in its least form, and also angels and spirits are in form perfectly human, for they are forms of heaven.  All the members devoted to generation in both sexes, especially the womb, correspond to societies of the third or inmost heaven, and for the reason that true marriage love is derived from the Lord’s love for the church, and from the love of good and truth which is the love of the angels of the third heaven; therefore marriage love, which descends therefrom as the love of that heaven, is innocence, which is the very being (esse) of every good in the heavens.  And for this reason embryos in the womb are in a state of peace, and when they have been born as infants are in a state of innocence; so, too, is the mother in relation to them.

As this is the correspondence of the genital organs in the two sexes, it is evident that by creation they are holy, and therefore they are devoted solely to chaste and pure marriage love, and are not to be profaned by the unchaste and impure love of adultery, by which man converts the heaven in himself into hell; for as the love of marriage corresponds to the love of the highest heaven, which is love to the Lord from the Lord, so the love of adultery corresponds to the love of the lowest hell.

The love of marriage is so holy and heavenly because it has its beginning in the inmosts of man from the Lord Himself, and it descends according to order to the outmosts of the body, and thus fills the whole man with heavenly love and brings him into a form of the Divine love, which is the form of heaven, and is an image of the Lord.  But the love of adultery has its beginning in the outmosts of man from an impure lascivious fire there, and thus, contrary to order, penetrates toward the interiors, always into the things that are man’s own, which are nothing but evil, and brings these into a form of hell, which is an image of the devil.  Therefore a man who loves adultery and turns away from marriage is in form a devil.

As the organs of generation in the two sexes correspond to the societies of the third heaven, and the love of a married pair corresponds to the love of good and truth, so those organs and that love correspond to the Word.  The reason is that the Word is Divine truth united to Divine good going forth from the Lord; and this is why the Lord is called “the Word,” also why in every particular of the Word there is a marriage of good and truth, or a heavenly marriage.  That there is such a correspondence is a mystery not yet known in the world, but it has been made evident and proved to me by much experience.

From this also it is clear how holy and heavenly marriages are in themselves, and how profane and diabolical adulteries are.  And for this reason adulterers make no account of Divine truths and thus of the Word, and if they were to speak from the heart they would even blaspheme the holy things that are in the Word.  This they do when they have become spirits after death, for every spirit is compelled to speak from the heart, that his interior thoughts may be revealed. (A.E., n. 985.)