101. That the heat and light or spiritual essence emanating from the Lord as the sun are united may be illustrated by the heat and light which emanate from the sun in the natural world. These two are also united as they radiate from that sun. That they are not united on earth is owing not to the sun but to the earth. For the earth turns daily on its axis and travels annually along the ecliptic in its orbit about the sun. This produces the appearance that heat and light are not united; for in the middle of summer we have more heat than light, and in the middle of winter more light than heat. [2] It is the same in the spiritual world, only the earth there does not rotate or orbit the sun, but angels turn themselves more or less directly toward the Lord. Those who turn themselves more directly to Him receive more warmth and less light, while those who turn themselves less directly to Him receive more light and less warmth. So it is that the heavens formed of angels have been distinguished into two kingdoms, one of which we call celestial, and the other spiritual. Celestial angels receive more warmth, and spiritual angels more light. The appearance of the lands on which they dwell also varies in accordance with their reception of heat and light. There is a complete correspondence, provided one substitutes for the motion of the earth a variation in the state of the angels.