Apocalypse Explained #611
611. But in the days of the voice of the seventh angel, when he is about to sound.- That this signifies the last state of the church, and then revelation of Divine Truth, is evident from the signification of the days of the voice of the seventh angel, as denoting the last state of the church; for the progressive changes of the state of the church are described by the sounding of the seven angels, therefore the voice of the seventh angel signifies the last state; and from the signification of, when he is about to sound, as denoting revelation then of Divine Truth. That by sounding a trumpet or horn is signified the influx of Divine Truth, and its revelation, may be seen above (n. 502). That its revelation is here signified, is evident from the following part of this verse, where it is said, "And the mystery of God shall be consummated, as he hath declared in good tidings to his servants the prophets." This signifies that the prediction concerning the coming of the Lord shall then be fulfilled. With the coming of the Lord there is also revelation of Divine Truth.
Luke 3:16-18
16
John answered them all, "I indeed baptize you with water, but he comes who is mightier than I, the latchet of whose sandals I am not worthy to loosen. He will baptize you in the Holy Spirit and fire,
17
whose fan is in his hand, and he will thoroughly cleanse his threshing floor, and will gather the wheat into his barn; but he will burn up the chaff with unquenchable fire."
18
Then with many other exhortations he preached good news to the people,