Paul wrote about the benefit of circumcision. Being circumcised did not help people to be at peace with God. However, people who were circumcised were Jews. These people were taught about God. Therefore, this helped them to know more about God and helped them to believe in Jesus.
God revealed certain things to the Jews through prophets. He gave them the Law of Moses (see: Acts 7:38). He also told them other prophecies (see: 1 Peter 4:11). Paul wanted people to know that God gave them Bible to people.
Israel abolished God’s faithfulness by rejecting Jesus. That is, they were not faithful to God when God was faithful to them. Paul taught that even if they disobeyed the things God revealed to them, they were still true things.
Paul wrote, “may it never be.” He wanted to say, “absolutely not!” (see: 1 Corinthians 6:15; Galatians 2:17; 3:21; 6:14; also Luke 20:16). Paul wrote these words 10 times in Romans (see: Romans 3:6; 3:31; 6:2; 6:15; 7:7; 7:13; 9:14; 11:1; 11:11).
Paul wrote the same thing as Psalm 51:4. He wanted people to know that God revealed himself to people in the Bible. He also wanted people to know that God kept the promises he made to people even if people sin.
Paul wrote about something multiplying God’s glory. That is, it makes God more glorious. Some people thought they should sin because it made people think God was more holy. They should not do this because it did not honor God.
Paul wrote, “slandered as saying, and as some affirm that we say.” He was writing about certain people lying about him. They said that Paul taught that people could sin and still be at peace with God.
See: Matthew 5:11; Romans 6:15; Galatians 5:13; 2 Peter 3:15-16
Paul asked, “are we excusing ourselves?” Some scholars think Paul was asking if people are trying to defend or excuse themselves. Other scholars think Paul was asking if the Jews were better than the Gentiles in some way (see: 3:1-2).
Why did Paul write many things that were also written in the Old Testament?
Paul wrote the same things that were written in the Old Testament. He wanted people to know that the gospel was teaching the same things about God that were written in the Old Testament.
God made no “distinction”(διαστολή/g1293) between different groups of people. That is, God is just to everyone (see: Deuteronomy 32:4; Psalm 9:7-8; 98:9; Zephaniah 3:5; Revelation 19:2).
Paul wrote that all have come short of the glory of God. Some scholars think Paul was speaking about Adam and Eve. These scholars think that Adam and Eve had a type of glory you could see before they sinned. After they sinned, they lost this glory. More scholars think Paul was speaking about how everyone sins. They are not perfect like God and do not always do what God wants them to do.
Paul wrote about the law. Here, he was talking about general rules. He was not speaking about the Law of Moses. Paul wanted people to know that people are saved through faith, not because of the things they do.
Paul said that God is one because this is something the Jews said in all of their prayers (see: Deuteronomy 6:4). Paul wanted people to know that there is only one God.
Paul wrote about someone destroying the law in some way. People thought Paul dishonored God because he did not obey the Law of Moses. However, he lived in a way that honored God.