And hence the Apostle in the second chapter of his Epistle to the Romans says that God will reward every man according to his works. To those who are good, He will give eternal life; to those who are evil, indignation and wrath. This is only saying that the eternal principles of justice are still in force. If any man can present himself before the bar of God and prove that he is free from sin, either imputed or personal, either original or actual, he will not be condemned. (Charles Hodge, Systematic Theology, 2:122)
According to Charles Hodge, Romans 2:6-10 is not about some idea that believers would bring forth "Spirit-wrought works," as what John Piper believes, but that it speaks about the condition of perfect obedience required in the Covenant of Works. It is because the Covenant of Works is still valid that Man continue to die physically. Death is caused by sin, and that all men die is proof that all men sin (Rom. 5:12).