For they being ignorant of God's righteousness, and going about to establish their own righteousness, have not submitted themselves unto the righteousness of God.
Read Chapter 10
Ambrosiaster
AD 400
Paul says that the Jews did not accept Christ because they were mistaken, not because there was any malice on their part. Commentary on Paul’s Epistles.
Paul said this about the Jews who because of their selfconfidence rejected grace and as a result did not believe in Christ. The Jews, he says, seek to establish a righteousness of their own that comes from the law, not that the law was established by them but rather that they had placed their righteousness in the law which comes from God by supposing that they were able to fulfill this law by themselves. For they were ignorant of the righteousness of God, not that righteousness whereby God is righteous but the one which comes to man from God.
The justice of God. That is, the justice which God giveth us through Christ; as, on the other hand, the Jews' own justice is that which they pretended to by their own strength, or by the observance of the law, without faith in Christ. (Challoner)
Seeking to establish their own. That is, for justice, or to be justified by their works, or the works of their written law. (Witham)
For this is what Paul says concerning these men: "For they, being ignorant of God's righteousness, and going about to establish their own righteousness, have not submitted themselves to the righteousness of God. For Christ is the end of the law for righteousness to every one that believeth."
Once again, ignorance would seem to be an excuse for pardoning them. But it turns out to lead only to a stronger accusation…. It was from smallmindedness and a desire for power that they erred rather than from ignorance, and even their own righteousness was not based on keeping the law.