“The sun that angels see” (the sun that gives them warmth and light) does not mean the Lord himself. It means that first emanation from him that is the highest form of spiritual warmth. The highest form of spiritual warmth is spiritual fire, which is divine love and wisdom in its first correspondential form. This is why that sun looks fiery and also is fiery for angels, though it is not for us. What we experience as fire is not spiritual but physical, and the difference between these two is like the difference between life and death. The spiritual sun, then, brings spiritual people to life with its warmth and maintains spiritual things, while the physical sun does the same for physical people and things. It does not do this with its own power, though, but by an inflow of spiritual warmth that provides it with effective resources.
The spiritual fire where light dwells in its origin becomes a spiritual warmth and light that decrease as they emanate, with the decrease occurring by levels that will be discussed later. The ancients pictured this as brightly gleaming circles of reddish fire around the head of God, a form of representation that is still common today when God is portrayed as human in paintings.
It is obvious from actual experience that love generates warmth and wisdom generates light. When we feel love, we become warmer, and when we think from wisdom, it is like seeing things in the light. We can see from this that the first thing that emanates from love is warmth and that the first thing that emanates from wisdom is light. We can also see that these are correspondences, since the warmth does not occur within the love itself but as a result of it, in our volition and therefore in our bodies. The light does not occur within the wisdom, but in the thinking of our discernment and therefore in our speaking. That is, love and wisdom are the essence and life of warmth and light; and warmth and light are emanations from love and wisdom. Because they are emanations from them, they are also responsive to them.
from Divine Love and Wisdom, Sections 93-95