The Seven Churches of Asia

As stated in Revelation 1:11, Christ sent a message to each of seven local churches in Asia Minor (Revelation 1:4, 11). The order of mention in 1:11 was geographic. That is, the order in which the churches are named matches the way they would be encountered if  a messenger would travel the established Roman routes from the seaport of Ephesus 35 miles north to the seaport of Smyrna. If that same messenger would continue north and to the east, to Pergamos, and then would swing further to the east and south, he would be able visit the other four cities (1:11).
What do these addresses mean? There has been more than a little debate about the significance of these messages for the modern church. Obviously these ancient fellowships were specially selected  to provide characteristic situations which the church would confront throughout history. Just as Paul’s epistles, though addressed to individual churches, are also intended for the entire church, so these seven messages also apply to the entire church today insofar as they are in similar situations. There were many other churches such as those at Colosse, Magnesia, and Tralles, some larger than the seven churches mentioned in Asia Minor, but these were not addressed.
As the contents of the letters are analyzed, it is clear that they are, first, messages to these historic local churches in the first century. Second, they also constitute a message to similar churches today. Third, individual exhortations to persons or groups in the churches make it clear that the messages are intended for individuals today. Fourth, some believe that the order of the seven churches follows the order of various eras in church history from the first century until now.
There are some remarkable similarities in comparing these letters to the seven churches to the movement of church history since the beginning of the apostolic church. For instance, Ephesus seems to characterize the apostolic church as a whole, and Smyrna seems to depict the church in its early persecutions. However, the Scriptures do not expressly authorize this interpretation, and it should be applied only where it fits naturally. After all, these churches all existed simultaneously in the first century.
Though each message is different, the letters have some similarities. In each one Christ declared that He knows their works; each one includes a promise to those who overcome; each one gives an exhortation to those hearing; and each letter has a particular description of Christ that related to the message which follows. Each letter includes a commendation (except the letter to Laodicea), a rebuke (except the letters to Smyrna and Philadelphia), an exhortation, and an encouraging promise to those heeding its message. In general these letters to the seven churches address the problems inherent in churches throughout church history and are an incisive and comprehensive revelation of how Christ evaluates local churches.
This portion of Scripture has been strangely neglected. While many turn to the epistles of Paul and other portions of the New Testament for church truth, often the letters to these seven churches, though coming from Christ Himself and being climactic in character, are completely ignored. This neglect has contributed to churches today not conforming to God’s perfect will.

References

Walvoord, J. F. (1985). Revelation. In J. F. Walvoord & R. B. Zuck (Eds.), The Bible Knowledge Commentary: An Exposition of the Scriptures (Vol. 2, pp. 932–933). Victor Books.