262. As of a trumpet speaking with me, signifies clear and manifest. This is evident from the signification of "trumpet," as being Divine truth manifested and revealed out of heaven (of which above, n. 55. A voice that is heard out of heaven with those who are in the spirit is heard usually as a human voice; but it was heard "as a trumpet speaking" because it was clearly and manifestly perceived by the angels, and what is clearly and manifestly perceived by them falls loudly into the hearing of the spirit; and this was done with John that his attention might be awakened, and thence his sight, lest anything should be obscure to him. This is meant by "the voice of a trumpet" in other places also (Matthew 24:31; Zechariah 9:14; Psalms 47:5; Revelation 8:2, 7-8, 13; 9:1, 13-14; 10:7; 18:22).

Armies of the heavens and the sands of the sea ('Jeremiah 33:15-22') signify the knowledges of truth and good in the spiritual and natural man.

(Odkazy: Apocalypse Explained 444)