447. III. THAT FORNICATION BELONGS TO THE NATURAL MAN in like manner as does love of the sex which, if it becomes active before marriage, is called fornication. Every man is born corporeal, becomes sensual, then natural, and successively rational, and if he does not stop there, he becomes spiritual. The reason why his progress is such, is that planes may be formed upon Which higher planes may rest as a palace on its foundations. The ultimate plane with its superstructure may also be likened to a ground in which, when prepared, noble seeds are planted.  As specifically regards love of the sex, it also is first corporeal, for it commences from the flesh. It then becomes sensual, for from its general [delight] the five senses are delighted. After that it becomes natural, like the same love with animals, being a roaming love of the sex. But because man was born that he may become spiritual, it later becomes natural-rational, and from natural-rational, spiritual, and at last spiritual-natural. Then that love, now become spiritual, inflows into and actuates the rational love and through this the sensual love, and finally through this the love in the body and the flesh; and this being its ultimate plane, it acts into it spiritually and at the same time rationally and sensually. It inflows and acts successively in this way when man is in meditation upon it, but simultaneously when he is in the ultimate.  That fornication belongs to the natural man is because it proceeds proximately from the natural love of the sex, and while this love may be natural-rational, it is not spiritual. Love of the sex cannot become spiritual until it becomes conjugial, and from being natural it becomes spiritual when man recedes from roaming lust and devotes himself to one, to whose soul he unites his own soul.