10 Then I heard a loud voice in heaven, proclaiming,
“Now have come the salvation and the power
and the kingdom of our God
and the authority of his Messiah,
for the accuser of our comrades has been thrown down,
who accuses them day and night before our God.
11 But they have conquered him by the blood of the Lamb
and by the word of their testimony,
for they did not cling to life even in the face of death.
12 Rejoice then, you heavens
and those who dwell in them!
But woe to the earth and the sea,
for the devil has come down to you
with great wrath,
because he knows that his time is short!”
Here a voice from heaven steps in to narrate the events that have happened so far, and gives humanity a warning. We are told that we are subject to 'woe to the earth and the sea' now that Satan has been cast out of heaven, and with his angels has fallen down to earth to cause chaos and consternation, (though according to the verses his time to do so is limited).
I find the description of Satan in verse ten really interesting; he is called "the accuser" and is said to accuse those devoted to God, 'day and night'. This verse is referring to Satan as a tormenter; it's a reference I have also heard used here and there over the years in by different people in reference to toxic shame or guilt, describing the 'voices in our heads' that continually remind us of our failures or misdeeds from the past. Maybe this is the voice of Satan or demons, constantly accusing us and trying to break our faith in the forgiveness of Jesus Christ.
The article at the following link talks about the nature of Satan as the accuser or the adversary as well: Satan the Accuser .This article at gotquestions.org explains the role of the accuser this way: "Satan the accuser desires to remind believers of their sin and their unworthiness of a place in God’s family and in this way sow doubt into their hearts and minds," and reminds us that, "in spite of Satan’s accusations and deceptions, God will not change His mind about those He has called to salvation."
A Prayer for Salvation from Christ:
Lord Jesus, I confess my sins and ask for your forgiveness. Please come into my heart as my Lord and Savior. Take complete control of my life and help me to walk in Your footsteps daily by the power of the Holy Spirit. Thank you Lord for saving me and for answering my prayer.
A more detailed step by step process:
https://www.wikihow.com/Accept-Jesus-Into-Your-Life