What does Revelation 2:10 mean?
In this verse we learn that Jesus predicted further suffering for the church at Smyrna. Some of the believers would encounter imprisonment and death. The Devil would be responsible for this hateful treatment, but Jesus told the believers not to fear. Early in His earthly ministry Jesus had counseled, "Do not fear those who kill the body but cannot kill the soul. Rather fear him who can destroy both soul and body in hell" (Matthew 10:28). He continued His counsel by asserting that our heavenly Father's eye is on the sparrows and He values us more than many sparrows (Matthew 10:29).The "ten days" in Revelation 2:10 may refer to ten persecutions that began with Nero and ended with Diocletian at the end of the third century. Christians are not promised to be kept from persecution, but we are kept in—or through—persecution. Jesus never leaves us or forsakes us; therefore we can say, "I will not fear; what can man do to me?" (Hebrews 13:5–6)
Jesus promises the crown of life to those who remain loyal. The "crown" refers to the wreath that was given to the winner of an athletic contest. At the end of life's race an imperishable wreath awaits all who faithfully served Christ even unto death (1 Corinthians 9:25).