What does Revelation 20:6 mean?

According to this verse whoever participates in the first resurrection is blessed and holy. "Blessed" is a beatitude that means "happy" or "spiritually prosperous." A blessed person may not be materially rich, but he is happy and spiritually prosperous. All who rise from the dead in the first resurrection, regardless of when or how they died, are blessed, and they are free forever from the second death. The second death refers to suffering forever in the lake of fire (Revelation 20:14).

Participants in the first resurrection will perform priestly and kingly duties during the thousand-year reign of Christ. The designation, "thousand years," occurs six times in chapter 20, so it would be hard to reject this designation as something other than a literal period of time. Prior to the thousand years, Christ returns to earth and destroys the armies that oppose Him. He throws the Beast and the False Prophet into the lake of fire. Also, before the thousand years begin, an angel incarcerates Satan in the bottomless pit, tribulation martyrs are resurrected, and thrones of judgment are established (Revelation 20:1–4).