The man who has a conscience suffers whilst acknowledging his sin. That is his punishment.
Fyodor DostoevskyWoe to the suicides! I believe that there can be none more miserable than they. Oh, there are some who remain proud and fierce even in hell, in spite of their certain knowledge and contemplation of the absolute truth; there are some fearful ones who have given themselves over to Satan and his proud spirit entirely. For such, hell is voluntary and ever consuming; they are tortured by their own choice. For they have cursed themselves, cursing God and life. And they will burn in the fire of their own wrath forever and yearn for death and annihilation. But they will not attain to death.
Fyodor DostoevskyWith old liars who have been acting all their lives there are moments when they enter so completely into their part that they tremble or shed tears in earnest, although at that very moment, or a second later, they are able to whisper to themselves, "You know you are lying, you shameless old sinner! You're acting now, in spite of your 'holy' wrath.
Fyodor Dostoevsky