Revelation 12:10,11

10  And I heard a loud voice saying in heaven, Now is come salvation, and strength, and the kingdom of our God, and the power of his Christ: for the accuser of our brethren is cast down, which accused them before our God day and night.

11  And they overcame him by the blood of the Lamb, and by the word of their testimony; and they loved not their lives unto the death.

There is a loud voice from heaven announcing that it is time for the Kingdom of God and the power of His Christ. Satan is cast down; Satan obviously had access to God before he was cast out because in this passage it tells us that he was the accuser of the brethren before God. He could not do that if he did not have access to the throne of God. Other passages in scripture also verify that Satan appeared before God and that he patrolled the earth to report to God (Job 1:6; Job 2:1). Now we see that Satan has been judged by God and cast down to earth.

Those who overcame the devil did so by the blood of Jesus, by their testimony and by dying for their faithfulness to Jesus even at the cost of their natural lives.