John Chrysostom
His death was the death of death. Since He died, He does not die again. This is what it means that He "died to sin."
What does "to sin" mean? It means that He was not, in Himself, liable to death, but died for our sin. He died in order to destroy sin, cut its sinews, and take away all its power.
Do you see how the Apostle has made this fearful? If Christ does not die a second time, then there is no second baptism. If there is no second baptism, then you must have no inclination toward sin.
The Apostle says all this in opposition to those who thought, "Shall we do evil that good may come?" (Rom 3:8), or, "Shall we continue in sin that grace may abound?" (Rom 6:1). Wishing to uproot such an opinion, he says this.
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"But the life He lives," he continues, "He lives to God." That is, He lives without interruption, so that death no longer has dominion over Him.
If Christ died the first death, not being liable to death, but for the sin of others, then all the more He will not die now, having destroyed sin.
Paul expressed the same thing in the Epistle to the Hebrews, saying: "Once, at the end of the ages, He appeared to put away sin by the sacrifice of Himself. And as it is appointed for men to die once, so Christ, having been offered once to bear the sins of many, will appear a second time, not to deal with sin, but for salvation to those who eagerly await Him" (Heb 9:26-28).
The Apostle shows both the power of life according to God and the might of sin. He shows the power of life according to God by saying that Christ will die no more. He shows the might of sin by saying that it moved the Sinless One to die. How, then, will it not destroy those who are truly guilty?