since there is only one God, who will justify the circumcised by faith and the uncircumcised through that same faith.
30. Who shall justify, The future is used for the present — “who justifies,” after the manner of the Hebrew language, though some consider that the day of judgment is referred to; but he seems to speak of a present act, or as Grotius says, of a continued act, which the Hebrews expressed by the future tense. — Ed. etc.
Man in his corrupted state can never gain acceptance with God by any works of his own. If we had never sinned, obedience would have saved us; but having sinned, nothing we do can atone for our guilt. All justification is resolved into the free grace of God through Christ alone, received by faith.
AI summary
Commenting on Romans 3:19-31
Verse 30. It is one God. The same God; there is but one, and his plan is equally fitted to Jews and Gentiles. The circumcision. Those who are circumcised--the Jews. The uncircumcision. Gentiles; all who were not Jews. By faith--through faith. There is no difference in the meaning of these expressions. Both denote that faith is the instrumental cause of justification, or acceptance with God. (e) "which shall justify"