181. Since there are degrees of love and wisdom, so there are degrees of heat and light. By heat and light are understood spiritual heat and light such as angels in the heavens have, and such as men have as to the interior things of their minds; for men have a heat of love and a light of wisdom similar to what the angels have. Thus it is in the heavens that such as is the nature and extent of the love which angels have, so is the nature and extent of their heat. The same is the case regarding light as to their wisdom. The reason is that with them love is in heat, and wisdom in light, as has been shown before. It is the same on earth with men with the difference, however, that angels feel that heat and see that light but men do not. This is because men are in natural heat and light, and so long as this is so, they do not feel spiritual heat except through a certain delight of love, and they do not see spiritual light except through a perception of truth. Now because man, while he is in natural heat and light, knows nothing of the spiritual heat and light with him, and as this cannot be known except through experience from the spiritual world, therefore the heat and light in which the angels and their heavens are will be specially spoken of here. From this and from no other source can there be enlightenment on this subject.