New Defender's Study Bible Notes
10:12 Jew and the Greek. Although Paul has been writing primarily to the Jewish believers in the Roman churches, he again stresses that the gospel applies equally to the Greek converts and, indeed, to all who call on the Lord Jesus.
10:13 whosoever shall call. See notes on Acts 2:21, where the same verse is quoted (Joel 2:32). Paul had been stressing God’s electing sovereignty in Romans 9; here he again stresses human responsibility. Both are true.