Everyone is by birth immersed in bodily concerns, and becomes more and more inwardly natural. His love of intelligence makes him rational, and later, if he has a love of wisdom, he becomes spiritual. I shall discuss later on (130) what the wisdom is which makes a person spiritual. Now as a person progresses from knowledge to intelligence, and from this to wisdom, so too his mind undergoes a change of form, becoming more and more open and more closely linked with heaven, and through heaven with the Lord. This makes him more fond of truth and more keen to live a good life. So if he stops at the first threshold in his progress towards wisdom, his mind retains a natural form, and this receives the influence of the universal sphere, that of the marriage of good and truth, in exactly the same way as the lower members of the animal kingdom, what we call animals and birds. These are utterly natural, and so the person becomes like them, and shares with them the same sexual love. This is what is meant by saying that sexual love belongs to the outward or natural person and is consequently shared with all animals.