It strikes me that this church has a reputation for being a good, healthy, alive group of believers - but God sees through the outward appearance to their hearts, and it's not good (remember how He described Himself having "eyes like blazing fire"?). And yet even in that, He gives a glimmer of hope - "Strengthen what remains and is about to die." How? Hear the Word, be in the Word, repent and turn to Him for forgiveness!
And then such a picture He gives for those who remain in Him in verses 4-6!
The church at Sardis couldn't blame a false doctrine or religious persecution for their troubles. They "suffered from internal spiritual decay that had reached advanced stages. They responded to external peace with internal apathy." (People's Bible on Revelation, pg 47)
Profound, isn't it? It makes me recall a workshop I attended at the 2013 LWMS convention in LaCrosse, WI. I was listening to a missionary who had served in Indonesia and I wrote these words:
How do I describe seeing a picture of the decapitated heads of teen Christian girls murdered on their way to school - A story no newspaper or tv reported on or a crime that was never prosecuted. There are no apathetic, lukewarm Christian in Indonesia and other Muslim dominated countries because frankly, they can’t afford to be. They either boldly declare Christ as their Saviour or they don’t at all.
The enemy of persecution is pretty in your face there. But apathy can be just as insidious in it's destruction. A good warning for today too. As we celebrate our Saviour's birth, we are encouraged and built up in our faith with the message it brings! "Joy to the World, the Lord has Come!"