101. That heat and light, that is, the spiritual going forth from the Lord as a Sun, make one, may be illustrated by the heat and light that go forth from the sun of the natural world. These two also make one in their going out from that sun. That they do not make one on earth is owing not to the sun, but to the earth. For the earth revolves daily round its axis, and has a yearly motion following the ecliptic, which gives the appearance that heat and light do not make one. For in the middle of summer there is more of heat than of light, and in the middle of winter more of light than of heat. In the spiritual world it is the same, except that there is in that world no daily or yearly motion of the earth; but the angels turn themselves, some more, some less, to the Lord; those who turn themselves more, receive more from heat and less from light, and those who turn themselves less to the Lord receive more from light and less from heat. From this it is that the heavens, which consist of angels, are divided into two kingdoms, one called celestial, the other spiritual. The celestial angels receive more from heat, and the spiritual angels more from light. Moreover, the lands they inhabit vary in appearance according to their reception of heat and light. If this change of state of the angels is substituted for the motion of the earth, the correspondence is complete.