In Isaiah 21:12, this signifies that, although there is illumination with people in the new church, people in the old church are still in a state of darkness and night. (Arcana Coelestia 10134[11])

5740. 'Morning dawned' means a state of enlightenment at this point. This is clear from the meaning of 'morning' and 'dawning' as a state of enlightenment. In the highest sense 'morning' means the Lord, see 2405, 2780, and therefore when the expression 'morning dawned' is used, a state of enlightenment is meant, since the Lord is the source of all enlightenment. 'Rising up in the morning' likewise means a state of enlightenment, see 3458, 3723.