Then I heard a loud voice in heaven, saying, “Now the salvation, and the power, and the kingdom of our God and the authority of His Christ have come, for the accuser of our brothers has been thrown down, he who accuses them before our God day and night.
Revelation 12:8 and they were not strong enough, and there was no longer a place found for them in heaven.
Revelation 12:9 And the great dragon was thrown down, the serpent of old who is called the devil and Satan, who deceives the whole world. He was thrown down to the earth, and his angels were thrown down with him.
Revelation 12:10 Then I heard a loud voice in heaven, saying, “Now the salvation, and the power, and the kingdom of our God and the authority of His Christ have come, for the accuser of our brothers has been thrown down, he who accuses them before our God day and night.
Revelation 12:11 And they overcame him because of the blood of the Lamb and because of the word of their witness, and they did not love their life even to death.
Revelation 12:12 For this reason, rejoice, O heavens and you who dwell in them. Woe to the earth and the sea, because the devil has come down to you, having great wrath, knowing that he has only a short time.”
The verse centers on "heard", "loud", "voice", "heaven", "saying", "salvation", "power", and "kingdom". It is saying that the verse draws attention to "heard" and "loud", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 9's "And the great dragon was thrown down..." into verse 11's "And they overcame him because of the...", so "heard" and "loud" belong inside that flow. In Revelation context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "heard" and "loud" with trust shaped by these words, not by a vague optimism outside the passage.