Jesus Christ did some very strange things after his crucifixion and resurrection. Good Friday and Easter Sunday meant that Jesus had defeated Satan, sin and death (I Cor 15:55-57). The gates of heaven were flung open to sinning and condemned human beings. The war was over and life had won over death.
However, unlike victors in earthly wars, Jesus left the enemy in place. He had put a leash on the Adversary, on Satan, but Satan is still allowed to tempt us, to try to lure us away from life to death. On top of that, Jesus left our sinful nature intact. We are just as prone to sin as we were before His Victory on the Cross. We are still born with original sin. In fact, we are born into a world that is in complete enmity against God (James 4:4). Jesus defeated the world, but then left it completely intact and His followers in it living side by side with the enemy.
Then, to top it off, Jesus went to heaven and left us in this mess! Of course, He did not leave us alone. He sent the Holy Spirit to live within us and guide us. But unlike our enemy, Satan, who forces himself upon us whether we want it or not, we have to make a conscious effort, every moment of our lives, to walk with the Holy Spirit while at the same time struggling with our still very intact sinful nature and living in a sinful world. Our every step is a constant, conscious struggle, and if we turn away from the Holy Spirit, Satan is right there to lure us to sin and death.
