In point of fact there were more churches of Jesus Christ in Asia than the seven mentioned in Revelation 1:11. There was, for example, also a church in Colossae. Seven
is a full number in Scripture (see Genesis 1:1–31; Genesis 2:2), and so symbolizes the totality of churches throughout the New Testament dispensation. Whatever those seven churches of Asia needed to hear is valid for all the Lord’s churches of all times and places.
4 John to the seven churches that are in Asia:Grace to you and peace from him who is and who was and who is to come, and from the seven spirits who are before his throne,