128. The Divine truth is light to the angels because the angels are
spiritual and not natural. Spiritual beings see from their sun, and
natural beings from theirs. It is from Divine truth that angels have
understanding, and their understanding is their inner sight, which
flows into and produces their outer sight; therefore in heaven
whatever is seen from the Lord as the sun is seen in light.{1} This
being the source of light in heaven the light is varied there in
accordance with the reception of Divine truth from the Lord; or what
is the same, in accordance with the intelligence and wisdom in which
the angels are, thus differently in the celestial kingdom and in the
spiritual kingdom, and differently in each society. In the celestial
kingdom the light appears flaming because the angels there receive
light from the Lord as a sun; but in the spiritual kingdom the light
is shining white, because the angels there receive light from the
Lord as a moon (see above, n. 118). So, too, the light differs in
different societies, and again in each society, those that are at the
center being in greater light and those in the circumference in less
light (see n. 43). In a word, the angels have light in the same
degree in which they are recipients of Divine truth, that is, are in
intelligence and wisdom from the Lord;{2} and this is why the angels
of heaven are called angels of light.

{Footnote 1} The light of heaven illumines both the sight and
the understanding of angels and spirits (n. 2776, 3138).

{Footnote 2} The light in heaven is in harmony with the
intelligence and wisdom of the angels (n. 1524, 1529, 1530,
3339). Differences of light in the heavens are as many as there