John Chrysostom
Although at first the Apostle answers the proposed question with a denial, because it is extremely inappropriate, he then turns the discourse to exhortation. He proves that the ease of the struggles is great, saying:
"Do you not know that to whom you present yourselves as slaves for obedience, you are slaves of the one whom you obey, either of sin leading to death, or of obedience leading to righteousness?"
I no longer speak, the Apostle reasons, of Gehenna and the grievous future punishment. I speak of the present shame, when you become slaves, and indeed voluntary slaves, slaves of sin, for such a reward that you should die again.
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If before baptism sin produced bodily death, and the wound required such healing that the Master of all accepted death and so destroyed the evil, then what will sin not produce when it has mastered you?
After so great a gift and freedom, you again and voluntarily bend under its yoke. Therefore do not strive toward this abyss. Do not surrender yourself voluntarily to sin.
During wars soldiers often surrender even against their will. But here no one will defeat you unless you yourself become a traitor.
Therefore, having fittingly inspired shame, the Apostle also frightens by recompenses. He points to the rewards for works of both kinds, namely righteousness and death, not bodily death, but a death far more terrible.
Indeed, if Christ will die no more, who will destroy this death? No one. Consequently, one must suffer punishment and torment eternally.
There will no longer be bodily death, as here, to give rest to the body and separate it from the soul. "The last enemy to be destroyed is death" (1 Cor 15:26).
Therefore the punishment will be immortal. But this is not what awaits those who obey God. Their reward will be righteousness and the good things that spring from it.