John was writing to the Church in Sardis…but he could be addressing the Church today in general. When he says, “Wake up!”, John is speaking not of just physically waking up and throwing off our lackadaisical Christianity…but of waking up morally and realizing we have been compromising our faith away. John was talking about comfortable or lazy Christianity…we’re saved and satisfied…but all the while the rest of the world outside is dying and going to Hell.
What was John telling the Church in Sardis they needed to remember? It was the Gospel Message…the Good News of Jesus. We should never discount or dismiss the wonder-working power of the Gospel. For within its message is the Holy Spirit at work in hearts and minds. And when we hear and receive the Good News, it’s then our responsibility to obey and repent. For true repentance is a moral reorientation of our soul…a acknowledging of the error of our ways and a turning towards truth and righteousness…of turning to God.