23. There is one human God who is the source of everything. All the elements of human reason unite in, and in a sense center on, the fact that a single God is the Creator of the universe. As a result, rational people, on the basis of their shared understanding, neither do nor can think in any other way. Tell people of sound reason that there are two creators of the universe and you will feel within yourself how they recoil from this notion, perhaps simply from the tone of their voice in your ear. This enables us to see that all the elements of human reason unite and center on the oneness of God.

There are two reasons for this. The first is that in its own right, our very ability to think rationally is not our own property. It is a property of God within us. Human rationality in general depends on this fact, and this general property causes our reason more or less spontaneously to see the oneness of God. The second is that through our rational ability either we are in heaven's light or we draw from it some general quality of its thought, and the all-pervading element of heaven's light is that God is one.

This is not the case if we have used our rational ability to skew our lower understanding. In this case we still possess the ability, but by the distortion of our lower abilities we have steered it off course, and our rationality is not sound.

90. Since angels are spiritual beings, they cannot live in any warmth or any light that is not spiritual. We, on the other hand, cannot live in any warmth or any light that is not physical. This is because what is spiritual suits what is spiritual, and what is physical suits what is physical. If angels were to depend on physical warmth and light to even the least extent, they would be destroyed. It is absolutely wrong for their life.

Each of us is a spirit, as far as the inner levels of our minds are concerned. When we die, we leave this world of nature completely behind. We give up everything it has to offer and enter a world that contains nothing proper to the world of nature. In that world we live so completely distanced from nature that there is no communication along a continuum, that is, nothing like degrees of purity or coarseness. It is a case of before and after, with no communication except by correspondences.

It stands to reason, then, that spiritual warmth is not a purer form of physical warmth, that spiritual light is not a purer form of physical light, but that they are completely different in essence. Spiritual warmth and light derive their essence from a sun that is nothing but love, a sun that is life itself, while physical warmth and light derive their essence from a sun that is nothing but fire, containing no life whatever, as I have already stated [89].