[1 of 2] Swedenborg (1688-1772, Sweden): primary subject "Adultery" (search under Inner Life/Evil, Negative Emotion, Vice)": source "Spiritual Experiences, vol.3": detail "Section 4405"
The conversation was about adulteries, and the fact that they are wicked, even though they may appear to such as they, in the light of their lifestyle, as delightful. But that they are wicked is shown by the fact that marriages are the seminaries of the human race, and thence of the heavenly Kingdom, thus of all people in the lands, and of the souls, spirits and angels in the heavens, and are therefore to be kept holy, nor ever to be violated. Therefore also in the Word (Bible) and in the precepts of the decalogue, they are so severely forbidden. Civil laws also in the whole globe of lands utterly forbid them, because they are to be abhorred; and when such individuals only approach toward heavenly societies, they smell the stench of their own filthiness, and are cast headlong as if into hell, for the reason that they are the opposites of heavenly qualities, and because heaven and mutual love, which makes heaven, is founded on marriage love, and the Kingdom itself of the Lord is a marriage, and all marriage love descends from it, because from the Lord, who most deeply joins together, penetrates and touches the minds; also, that the light of his lifestyle, which is adulterous yet appears to him so delightful, if he should only approach toward heaven, would be turned into dreadful hellish darkness, so that he would then realize with horror that his own life, from which that light comes, was utterly infernal.

[2 of 2] Swedenborg (1688-1772, Sweden): primary subject "Love, conjugial (marriage)" (search under Inner Life/Love, Positive Emotion, Virtue, Will)": source "Conjugial Love": detail "Section 425"
He that does not know what conjugial love is, does not know what adulterous love is; and moreover, that from adulterous love it is not known what conjugial love is, but from conjugial love it is known what adulterous love is. No one knows good from evil, but evil from good; for evil is in darkness, whereas good is in light.