Sardis was about 80 kilometers (50 miles) east of Smyrna on the southeast highway from Pergamum and Thyatira. It was home to a large community of wealthy Jews. They were called “Sephardic” because this name came from an ancient name for the city. The city also had a strong, fortified acropolis, which often gave its people too much confidence in their own safety.
Other churches may have thought the Christians in Sardis were active and strong. However, their focus on worldly life showed that they lacked true spiritual life.