I asked this question in a comment to another question's answer, but I wanted to ask it explicitly:
It has been stated that :
[...] it has been pointed out in Rishonim [...] that some sins are so bad they can't get a punishment - because the punishment creates forgiveness, but when the sin is too great, forgiveness is not an option.
If so, what happens to the one who commits such a sin?
Is he punished in the afterlife instead of by humans in this world? But that would also be a punishment/kaparah and hence affect forgiveness. Or is he not punished anywhere (this world or the next world)? That doesn't make sense as well - since then he gets off scot free.