Like A Trumpet

Revelation 1:10-11 (ESV Strong's)

10 I was in the Spirit on the Lord's day, and I heard behind me a loud voice like a trumpet 11 saying, “Write what you see in a book and send it to the seven churches, to Ephesus and to Smyrna and to Pergamum and to Thyatira and to Sardis and to Philadelphia and to Laodicea.”

The Holy Spirit is the angel of the Lord who John soon reveals as Christ Jesus. One of the Old Testament uses of a trumpet was “to give signals of war.”  (NTThe) This might be useful in interpreting its use in this verse. The voice of the Lord speaks of the beginning of the last days when the work of God is finished. The trumpet is also used in calling convocations. Most notable for the Church has to be the sound of the last trumpet that signals the gathering of the body of Christ at His return. 

He begins with His last words to the people of the churches and to the church as a whole, giving instructions, encouragement, and warnings to guide them in the way of the Lord. In each letter He ends with the blessings and glory that will be given to all who overcome the world. They will be the light He has separated from the darkness. They will become one with the light of the world.