Whoever has ears, let them hear what the Spirit says to the churches.
The one who is victorious will not be hurt at all by the second death.
Rev 2:11
What do they mean by being victorious? Who is it who overcomes the world?
"I have told you these things, so that in me you may have peace. In this world you will have trouble. But take heart! I have overcome the world."(Jesus speaking in John 16:33)
everyone born of God overcomes the world. This is the victory
that has overcome the world, even our faith. 1 John 5:4
Blessed and holy are those who share in the first resurrection. The second death has no power over them, but they will be priests of God and of Christ and will reign with him for a thousand years. Rev 20:6
Then death and Hades were thrown into the lake of fire.
The lake of fire is the second death. Rev 20:14
But the cowardly, the unbelieving, the vile, the murderers, the sexually immoral, those who practice magic arts, the idolaters and all liars--they will be consigned to the fiery lake of burning sulfur. This is the second death. Rev 21:8
Keep in mind, there is no condemnation for those in Christ Jesus. We have been washed clean through faith in the righteous blood of Jesus Christ, shed on our behalf, out of His great love for us, that we may attain to life ever after.