91. We can see in the human face what correspondence is like. In a face that has not been taught to dissimulate, all the affections of the mind manifest themselves visibly in a natural form, as though in their very imprint, which is why we refer to the face as "the index of the mind." This is our spiritual world within our natural world. Similarly, elements of our understanding are manifest in our speech, and matters of our volition in our physical behavior. So things that occur in the body, whether in our faces or in our speech or in our behavior, are called correspondences.

173. Things that arise in the heavens do not arise in the same way as things on earth. In the heavens, everything comes into being from the Lord in response to the deeper natures of the angels. Angels do in fact have more inward and more outward natures. Everything that is deeper within them has to do with love and faith, and therefore with their intending and discernment, since their intending and discernment are the vehicles of their love and faith. Their more outward natures, though, are perfectly responsive to their inner natures (on the responsiveness of their outward natures to their more inward ones, see 87-115 above). This can be illustrated by what we have said above about heaven's warmth and light, that angels have warmth in keeping with the quality of their love, and light in keeping with the quality of their wisdom (see 128-134). The same holds true for the other things that impinge on angels' senses.