135. Love going forth from the Lord as a sun is felt in heaven as heat, because the interiors of the angels are in a state of love from the Divine good that is from the Lord; and in consequence their exteriors which grow warm therefrom are in a state of heat. For this reason heat and love so correspond to each other in heaven that everyone there is in heat such as his love is, according to what has been said just above. This world's heat does not enter heaven at all, because it is too gross, and is natural, and not spiritual; but with men it is otherwise, because they are in both the spiritual world and the natural world. As to their spirits they grow warm in exact accordance with their loves; but as to the body they grow warm both from the heat of their spirit and from the heat of the world. The former flows into the latter, because they correspond. The nature of the correspondence of the two kinds of heat can be seen from animal life, in that the love of animals-the chief of which is the love of propagating offspring of their kind-bursts forth and becomes active in accordance with the presence and influence of heat from the sun of the world, which is the heat of the spring and the summer seasons. Those who believe that the world's heat flows in and excites these loves are greatly mistaken, for there can be no influx from the natural into the spiritual, but only from the spiritual into the natural. This influx is of Divine order, but the other would be contrary to Divine order.{1} {Footnote 1} There is spiritual influx, but not physical, that is, there is influx from the spiritual world into the natural, but not from the natural world into the spiritual (n. 3219, 5119, 5259, 5427, 5428, 5477, 6322, 9109, 9110, 9111).