16. 14 Unknown until now, there are three levels in the spiritual world and three in this earthly world, and these shape the way all inflow happens.
INQUIRY into causes from their effects leads to the discovery that there are two different kinds of levels, one kind that deals with prior versus subsequent, and one kind that deals with greater versus lesser. The ones that distinguish prior from subsequent are to be called vertical or distinct levels, while the ones that distinguish greater from lesser are to be called horizontal or gradient levels.
[2] Examples of vertical or distinct levels may be found in the way one thing is generated by or composed of another—a nerve, for instance, is made up of fibers, and each fiber is made of fibrils; or every type of wood, stone, and metal is made of component elements, and each element is made of particles. In contrast, examples of horizontal or gradient levels are things on the same vertical level that lie along a range of greater or lesser length, width, height, or depth—such as larger or smaller volumes of water, air, or ether, for instance, or massive versus miniscule amounts of wood, stone, or metal.
[3] Everything great and small in the spiritual and physical worlds is characterized by both kinds of levels. The whole animal kingdom in this world is arranged in these levels overall and in detail, and so are the whole plant kingdom, the whole mineral kingdom, and even the span of atmospheres from the sun down to the earth.
[4] This means that in the spiritual world as well as in the physical world there are three atmospheres on distinct vertical levels, since there is a sun in each world. However, the atmospheres of the spiritual world are substantial by virtue of their origin; the atmospheres of the physical world are material in origin. Further, since the atmospheres come down from their origins by these levels, and since they are the vessels and, so to speak, the vehicles that transport light and warmth, it follows that there are three levels of light and warmth; and since the essence of the light in the spiritual world is wisdom and the essence of the warmth there is love, as explained in the appropriate section above [§6], it also follows that there are three levels of wisdom and three levels of love, and therefore three levels of life. The levels are characterized by the things that pass through them.
[5] As a result, there are three angelic heavens: a highest heaven, also called the third heaven, where angels of the highest level live; a middle heaven, also called the second heaven, where angels of the intermediate level live; and a lowest heaven, also called the first heaven, where angels of the lowest level live. These heavens are differentiated according to their levels of wisdom and love. Those in the lowest heaven are engaged in a love of knowing about what is true and good, those in the middle heaven are engaged in a love of understanding these matters, and those in the highest heaven are engaged in a love of being wise, which is a love of living according to what they know and understand.
[6] Because the angelic heaven is differentiated into three levels, the human mind, being an image of heaven or a heaven in miniature, is differentiated into three levels as well. This is why we can become angels of one or another of the three heavens; and this happens according to our acceptance of wisdom and love from the Lord. We become angels of the lowest heaven if we accept only a love of knowing about what is true and good, angels of the middle heaven if we accept a love of understanding these matters, and angels of the third heaven if we accept a love of being wise, that is, of living by them. On the division of the human mind into three areas matching the heavens, see the account included in Marriage Love 270.
We can see from all this that the spiritual inflow toward us and into us from the Lord comes down through these three levels, and that it is accepted by us according to the level of wisdom and love in which we are engaged.
[7] Familiarity with these levels is particularly useful nowadays because so many people, not knowing about them, are fixated on the lowest level, where our physical senses are. Being stuck in an ignorance that is a darkness in their understanding, they cannot rise into the spiritual light that is above them. As a result, materialism barges in of its own accord the moment they try to make serious inquiries into anything about the soul, the human mind, or its rational functions, and is even more intrusive if they inquire into heaven or life after death. They become like the people who stand outdoors, telescopes in hand, scanning the skies and uttering meaningless prophecies, or like the people who respond to every object they see and everything they hear by chattering on and on and arguing about it without a trace of rationality or understanding. Or they are like butchers who think they know all about anatomy because they have examined the outsides but not the insides of the organs of cattle and sheep.
[8] The truth of the matter is that unless an inflow of earthly light is enhanced by an inflow of spiritual light, our thinking is a strange dream and our discourse based on this kind of thinking is fortune-telling.
There is more about levels in Divine Love and Wisdom (published in Amsterdam in 1763) §§173–281.