To the seven churches in the province of Asia:
Grace and peace to you from him who is, and who was, and who is to come, and from the seven spirits before his throne, 5 and from Jesus Christ, who is the faithful witness, the firstborn from the dead, and the ruler of the kings of the earth. (Revelation 1:4-5 NIV)
The book of Revelation was written to all true Christians, including those of us alive today (see Revelation 1:1). However, additionally, it had specific messages for seven individual churches that existed during the time that John penned this book (probably around 96 AD). These were seven churches that existed in “Asia” i.e. Asia Minor, which is in modern day Turkey. In chapters 2 and 3 Jesus sends a personal message to each of these churches individually. These churches went extinct a long time ago, so the messages that Jesus sent them do not necessarily apply directly to us today. However, God chose to give us these letters for us to learn from, and therefore the principles that appear in these messages most certainly do apply to us, even when the letter of the message does not. Even though these letters may not have been written to my church directly, I can still use them to make a good guess what a letter from Jesus would look like if He did choose to write one to my current church. Therefore, our churches today should work hard to model the good things that Christ commends in these chapters, rather than the bad things that He condemns.