Arcana Coelestia # 21
21. Verses 4-5 And God saw that the light was good; and God made a distinction between the light and the darkness. And God called the light Day, and the darkness He called Night.
The light is called good, because it comes from the Lord, who is good itself. 'The darkness' is those things which were there prior to the person's new conception and birth. They were seen as light, because evil was seen as good, and falsity as truth. But in reality they are darkness and things proper to that person which are lingering on. All things that are the Lord's, being things of light, are compared to the day, and all that are man's own, being those of thick darkness, are compared to the night, as is done many times in the Word.
Heaven and Hell # 177
177. THE GARMENTS WITH WHICH ANGELS APPEAR CLOTHED.
Since angels are men, and live among themselves as men do on the earth, they have garments and dwellings and other such things, with the difference, however, that as they are in a more perfect state all things with them are in greater perfection. For as angelic wisdom surpasses human wisdom to such a degree as to be called ineffable, so is it with all things that are perceived and seen by angels, inasmuch as all things perceived and seen by them correspond to their wisdom (see above, 173).