Apocalypse Explained #611
611. Verse 7. But in the days of the voice of the seventh angel, when he is about to sound, signifies the last state of the church, and revelation at that time of Divine truth. This is evident from the signification of "the days of the voice of the seventh angel," as being the last state of the church; for as the progressive changes of the state of the church are described by the sounding of the seven angels, so "the voice of the seventh angel" signifies the last state; also from the signification of "when he is about to sound," as being the revelation at that time of Divine truth. That "to sound a trumpet or horn" signifies the influx of Divine truth and revelation of it, may be seen above n. 502; here the revelation of it is signified, as is evident from the rest of this verse, where it is said "the mystery of God shall also be finished, as He hath declared the good tidings to His servants the prophets," which signifies that the prediction respecting the Lord's coming shall then be fulfilled. With the Lord's coming there is also a revelation of Divine truth.
Heaven and Hell #154
154. How the States of Angels in Heaven Change
By "the changes of angels' states," we mean their changes in regard to love and faith and therefore in regard to wisdom and intelligence - to the state of their life, that is. States are attributes of life and of matters that pertain to life; and since angelic life is a life of love and faith and thereby of wisdom and intelligence, states are attributes of these, and we talk about states of love and faith and states of wisdom and intelligence. Now we need to describe how these states change for angels.