[2] As regards spiritual light, this is related to a person's understanding in the way that natural light is related to his external sight. That is to say, so that the eye can function, light must exist which enables it to do so. When it exists the eye beholds in that light everything all round outside itself. The same is true of the intellectual power of the mind, which is a person's inner eye. So that this eye can function the light of heaven flowing from the Lord must exist, enabling it to do so. And when this eye functions with the aid of that light it too beholds things all round outside itself. But the objects it sees are spiritual ones - facts and truths. When however it does not have the aid of that light, a person's intellectual power of the mind or inner eye is like his external or physical eye when this is in darkness and cannot see anything. That is, it does not from factual knowledge behold any truth, or from truth behold any good. The light which enables the intellectual power of the mind to function is light indeed, a kind of light which is a thousand times brighter than midday light in the world, as I can testify since I have beheld it. In that light all the angels in heaven see things all round outside themselves, and in that same light they also behold and perceive the truths of faith and the essential nature of them. This now explains why in the spiritual sense 'seeing' means not only the understanding but also any of its activities, such as cogitation, reflection, observation, circumspection, and many others, as well as meaning not only faith but also anything constituting faith, such as truth, teaching drawn from the Word, and the like.

[3] As regards spiritual heat however, this is related to a person's will in the way natural heat is related to his body, in that the one imparts life to the other. But by virtue of its very origin - an origin that can be traced back to the Lord - spiritual heat is nothing other than Divine Love towards the entire human race and the reciprocation of that love by man, to Him and also towards the neighbour. And that heat is heat indeed; it blesses angels' bodies with warmth and at the same time blesses their inmost beings with love. This is the reason why 'heat', 'flame', and 'fire', when used in the genuine sense in the Word, mean things connected with love, such as affections for goodness and truth, and also goodness itself.