He came to be a witness, so that he might testify concerning that Light, so that all people would believe [in Jesus] through him [i.e., through his testimony. See Acts 19:4].
So, now these [same] Jews have also been disobedient [to God], so that they may also now obtain [God’s] mercy by means of the mercy [He has] shown to you [Gentiles].
Being considered right with God is [obtained] through faith in Jesus Christ by every person who believes [in Him], for there is no favoritism [with God],
What then? Are we [Jews] any better off [than those Gentiles]? No, not at all, for we have already charged that both Jews and Greeks [i.e., Gentiles] alike are under [the power of] sin,
Now the Law of Moses was introduced [into the world] in order to cause sin to increase [i.e., it defined many things to be wrong that were previously not regarded as sin]. But with the increase of sin, God’s unearned favor increased all the more.
But the Scriptures indicate that everything [i.e., everyone] is under the control of sin, so that the promise [of never ending life] could be available [only] to those who have faith in Jesus Christ.
But before faith [in Christ] became available, we [Jews] were kept in bondage under [condemnation for not obeying perfectly] the Law of Moses. [This condition existed] until the faith [i.e., the Gospel message] was made known [to people].