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).

In most cases, "mouth" in the Bible represents thought and logic, especially the kind of active, concrete thought that is connected with speech. The reason for this is pretty obvious, but it also holds when people, for instance, remove a stone from the mouth of a well, which represents gaining access to spiritual ideas. The mouth is used for eating as well as speaking, of course. In those circumstances, it represents our first, most external perception of a new spiritual idea or desire. This also makes sense, mirroring the way tasting food in the mouth gives us an instant impression of the quality of the food.