John Chrysostom
See how many arguments the Apostle brings in confirmation of what has been said.
First, he proves it by the dignity of the person. This is not done by a man weak in powers, but by God, for whom all things are possible, since it is said that the righteousness is God’s.
Second, he proves it by the law and the prophets. Do not be afraid when you hear the words “apart from the law” (Rom 3:21), because this has meaning in relation to the law itself.
Third, he proves it by the Old Testament sacrifices. For this reason he said, “in His blood,” reminding the Jews of sheep and calves.
If, the Apostle says, the slaughter of irrational animals delivered from sin, much more will the blood of Jesus Christ do so.
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He did not simply say “purchase,” but “redemption,” so that we would not return again to the same slavery.
For this same reason he calls Jesus Christ a “propitiation.” He shows that if the type had such great power, the truth itself will have far greater effect.
Again, showing that this is not something recent and new, the Apostle says, “set forth beforehand.”
Having said “God set forth beforehand,” and having acknowledged this as the work of the Father, he shows that the same thing also belongs to the Son.
The Father set it forth beforehand, and Christ accomplished the whole work by His blood.
“To demonstrate His righteousness.” What does “demonstration of righteousness” mean?
The demonstration of wealth consists not only in being rich oneself, but also in making others rich. The demonstration of life consists not only in being alive oneself, but also in giving life to the dead.
The demonstration of power consists not only in being strong oneself, but also in strengthening the weak. So the demonstration of righteousness consists not only in being righteous oneself.
It also consists in instantly making righteous others who have decayed in sins.
Explaining this, the Apostle himself disclosed what “demonstration” means when he said, “that He might be righteous, and justify the one who has faith in Jesus.”