According to Scripture, demons are classified as either free or in prison. In his first letter, Peter mentions fallen angels who are “now in prison” (1 Pet 3:19). In his second letter he wrote, “God did not spare angels when they sinned, but cast them into Tartarus and committed them to pits of darkness, reserved for judgment” (2 Pet 2:4). And Jude wrote about fallen angels that God has kept in “bonds under darkness for the judgment of the great day” (Jude 1:6). It appears many of these fallen angels that are currently incarcerated will be released at a future time (Rev 9:1-11), four of which are exceptionally bad (Rev 9:13-15). Apparently, demons have some freedom and are permitted to defy God, albeit in a limited way. Clearly Satan operates by the boundaries God establishes (Job 1:6-21).