3338. Besides these lights there are also heats, which likewise are from two fountains-the heat of heaven coming from its sun, which is the Lord; and the heat of the world from its sun, which is the luminary visible to our eyes. The heat of heaven manifests itself to the internal man under the form of spiritual loves and affections; but the heat of the world manifests itself to the external man under the form of natural loves and affections. The former heat produces the life of the internal man, but the latter that of the external man; for without love and affection man cannot live at all. Between these two heats also there are correspondences. These heats become loves and affections through the influx of the Lord's life; and hence they appear to man as if they were not heats, although they are; for unless as to both the internal and the external man, man derived heat from this source he would fall down dead in a moment. These facts must be evident to everybody from the circumstance that in proportion as man is inflamed with love, he grows warm; and in proportion as love recedes, he grows torpid. It is this heat from which the will of man lives, and it is the light above spoken of from which comes his understanding.