From this it can be seen that the difference between these two delights is like that between heaven and hell. And yet, for a wonder, it is believed that the delight of marriage and the delight of adultery are similar; nevertheless the difference between them is such as has now been described. But the difference can be discerned and felt only by one who is in the delight of marriage love. One who is in that delight plainly feels that in the delight of marriage there is nothing impure or unchaste, thus nothing lascivious; and that in the delight of adultery there is nothing but what is impure, unchaste, and lascivious. He feels that unchastity comes up from beneath, and that chastity comes down from above. But one who is in the delight of adultery is incapable of feeling this, because he feels what is infernal as his heavenly. From all this it follows that the love of marriage, even in its outmost act, is purity itself and chastity itself; and that the love of adultery in its acts is impurity itself and unchastity itself. Since the delights of these two loves are alike in outward appearance, although inwardly they are wholly unlike, because opposites, the Lord provides that the delights of adultery shall not ascend into heaven and that the delight of marriage shall not descend into hell; and yet that there shall be some correspondence of heaven with prolification in adulteries, though none with the delight itself in them. (A.E., n. 990.) It has been said that marriage love, which is natural, descends from the love of good and truth, which is spiritual; this spiritual therefore is in the natural love of marriage as a cause is in its effect. So from the marriage of good and truth there comes forth a love of bearing fruit, that is, good through truth and truth from the good; and from that love a love of producing offspring descends, and in that love there is every delight and pleasure. On the contrary, love of adultery, which is natural, springs from a love of evil and falsity, which is spiritual; consequently this spiritual is in the natural love of adultery as a cause is in its effect. So from the marriage of evil and falsity by love there comes forth a love of bearing fruit, namely, evil through falsity and falsity from evil; and from that love a love of producing offspring in adulteries descends, and in that love there is every delight and pleasure.