165. (iii) _Man is led by the Lord through influx and taught through enlightenment._ Man is led through influx by the Lord because "being led" and "flowing in" are spoken of love and the will; and he is taught by the Lord through enlightenment because "being taught" and "enlightened" are spoken of wisdom and the understanding. It is known that every person is led by himself from his own love and according to it by others, and not by his understanding. He is led by his understanding and according to it only as his love or his will prompts the understanding, and then it can be said that his understanding is led also. Even then the understanding is not led, but the will which prompts it. The term "influx" is used because it is commonly said that the soul flows into the body; influx is spiritual and not physical, as we showed above, and man's soul or life is his love or will. For another reason, influx is comparatively like the flow of the blood into the heart and from the heart into the lungs. We showed in the treatise Divine Love and Wisdom that the heart corresponds to the will and the lungs correspond to the understanding, and that the conjunction of the will with the understanding is like the flowing of the blood from the heart to the lungs. 166. Man is taught, however, through enlightenment; being taught and being enlightened are said of the understanding. For the understanding or man's internal sight is enlightened by spiritual light quite as the eye or man's external sight is by natural light. The two are also taught similarly; the internal sight, however, which is that of the understanding, by spiritual objects, and the external sight or the sight of the eye by natural objects. There is spiritual light and natural light, one like the other in outward appearance, but dissimilar in internal appearance. For natural light comes from the sun of the natural world and so is in itself dead, but spiritual light, which is from the sun of the spiritual world, is in itself living. This light, not nature's, enlightens the human intellect. Natural and rational light comes from it and not from nature's light, and is here called natural and rational because it is spiritual-natural. [2] There are three degrees of light in the spiritual world: celestial, spiritual and spiritual-natural. Celestial light is a flaming, ruddy light and is the light of those who are in the third heaven; spiritual light is a gleaming white light and is the light of those in the middle heaven; and spiritual-natural light is like daylight in our world. This is the light of those who are in the lowest heaven and of those in the world of spirits, which is intermediate between heaven and hell; with the good in that world it is like the light of summer on earth and with the evil like winter's light.