Revelation 20:7

Satan shall be loosed - How can this bear any kind of literal interpretation? Satan is bound a thousand years, and the earth is in peace; righteousness flourishes, and Jesus Christ alone reigns. This state of things may continue for ever if the imprisonment of Satan be continued. Satan, however, is loosed at the end of the thousand years, and goes out and deceives the nations, and peace is banished from the face of the earth, and a most dreadful war takes place, etc., etc. These can be only symbolical representations, utterly incapable of the sense generally put upon them.

And when the thousand years are expired - See Revelation 20:2.

Satan shall be loosed out of his prison - See Revelation 20:3. That is, a state of things will then occur as if Satan should be for a time let loose again, and should be permitted to go as formerly over the world. No intimation is given "why or how" he would be thus released from his prison. We are not, however, to infer that it would be a mere arbitrary act on the part of God. All that is necessary to be supposed is, that there would be, in certain parts of the world, a temporary outbreak of wickedness, as if Satan were for a time released from his chains.

20:7 And when the former thousand years are fulfilled, Satan shall be loosed out of his prison - At the same time that the first resurrection begins. There is a great resemblance between this passage and Revelation 12:12 . At the casting out of the dragon, there was joy in heaven, but there was woe upon earth: so at the loosing of Satan, the saints begin to reign with Christ; but the nations on earth are deceived.