The letter to the church at Sardis was the fifth in a sequence of seven. The word Sardis means that which remains or the escape of the remnant. In reality, the period of time covered by the church of Sardis points to an epoch of deep apostasy within the church.
Yet it seemed that there was a remnant who managed to escape the apostasy and uphold the light of truth. However, though this message points forward to a distinct period of church history it also refers to the church at Sardis during the time the letter was sent and is a reflection of the spiritual condition of the church at that time.
In his commentary, W.M. Ramsay speaks of Sardis as the city of death and makes this interesting observation “Smyrna was dead and yet lived, Sardis lived, and yet was dead...the letter to the Sardian church breathes the spirit of death, of appearance without reality, promise without performance, outward show of strength betrayed by want of watchfulness and careless confidence”