Those who believe in Jesus “will not die forever,” unlike those who will. Even Aquinas agrees!
A while ago I wrote a post explaining that many Bible translations get John 11:25-26 wrong. They quote Jesus as saying “whoever lives and believes in me will never die.” This gives some people the impression (rightly or wrongly) that if you are a believer in Jesus, even when your body dies, you keep living because you go to heaven, continuously enjoying the eternal life that has already begun. As I explained (and you should read that post if this sounds strange to you), οὐ μὴ ἀποθάνῃ εἰς τὸν αἰῶνα is correctly translated not as “will never die,” but rather “will not die forever.” If you believe in Jesus, you won’t suffer the fate of dying forever. This is not a claim that you won’t die ever, but rather that you won’t die forever. You will die one day, but will be spared the fate of the lost, which is a final and irrevocable death, never to live again.