Why does Les emphasize Paul's final warning to Israel?
Paul's final warning to Israel marks a decisive turning point: after repeated appeals, Israel's rejection becomes final, and the salvation of God is sent to the Gentiles. It signals the departure from the gospel to Israel to the Gospel of Grace written to the Church.
Les emphasizes this final warning because Paul is in Rome in prison, and the passage shows Israel had been blind since Isaiah's day. Paul says he tried to get them to see the truth, but they would not. Though Paul had earlier said he would go to the Gentiles and still returned to appeal to Israel, this time it is final: salvation is sent to the Gentiles, and they will hear it. Les teaches this marks the point of departure in Paul's writings from the Gospels to the Church, the Gospel of Grace written to the Church.