Satan’s past, present and future are described here. Satan opposed Jesus when he attempted to have Him killed after His birth. Currently, Satan is in heaven accusing Jesus’ followers of wrongdoing. In the future, Satan will oppose Jesus’ return to the earth. None of this works; Jesus is always the victor.
For us today, Satan is accusing us of wrongdoing before God. This is pointless, because Jesus has died for our sin, but Satan points out our failures anyway. It’s interesting that before we sin, Satan tries to convince us that sin is not that big of a problem. After we sin, he uses it to try to get God to turn against us. It’s good we can read of Satan’s defeat and complete inability to stand up to God’s power!