Remember, the main character in the book of Revelation is the Church. Certainly Jesus plays a leading role as we see Him defeat Satan and evil from seven different perspectives, but He does so to rescue His bride, the Church, which includes you and me. So it only makes sense that this account begin with Christ calling to His Church. Although He addresses seven (we'll see this number often) particular congregations with their individual characteristics, it becomes clear that these churches are a synecdoche (word of the day: a figure of speech in which a part is made to represent the whole) of the universal Church of all times and places.
Notice that each of these mini-letters follows the same pattern:
To the church in _____________ , write...
These are the words of Him... [various descriptions of Jesus]
Even if Revelation was the only account in the Bible that told us about Jesus, we would still know everything we need to know about Him! There's a ton of theology in these descriptions!
Each mini-letter in today's chapter begins with an acknowledgement of the positive attributes of the church. It should be comforting for you to know that Jesus knows the good things you do, even if nobody else recognizes them!