Pelagius — on Rom 8:3 (PELAGIUS'S COMMENTARY ON ROMANS)

“The law was weakened in the flesh, not in itself. In saying "God sent his Son" Paul counters Photinus, who denied the Son's existence before the incarnation.… The Son took flesh like that of the rest of humanity and "he condemned sin in the flesh," i.e., he overcame like by like. Just as the sacrificial victims which the Jews offered under the law were given in the name of sin, although they had no sin themselves … so also Christ's flesh, which was offered for our sins, took the name of sin. Some people say that by the sin of the Jews, whereby they killed the Lord, Christ condemned in his humanity the sin of the devil, by which the devil had deceived mankind, as Paul says to the Hebrews: "so that through death he might destroy him who has the power of death." Or it may mean that through the substance of that flesh which previously was a slave to sin, Christ conquered sin by never sinning himself, and in his flesh he condemned sin to show that it was the will which was on trial, not human nature, which God created in such a way that it could avoid sinning.”