For I could wish that myself were accursed from Christ for my brethren, my kinsmen according to the flesh:
Note 3 at Ro 9:3: What a statement! Paul was saying that he would go to hell in the place of the Jews if that would accomplish their salvation. This is nothing less than the perfect "AGAPE" love (see note 4 at Joh 13:35) that Jesus demonstrated when He died for our sins.
Although this desire on Paul's part is commendable, there is nothing that he could have accomplished that Jesus hadn't already accomplished completely. Paul was specifically commissioned by the Lord to go to the Gentiles, yet we see him repeatedly going to the Jews, even after he said he wouldn't do that anymore (see note 2 at Ac 13:14). Paul even went to Jerusalem, apparently against the instruction of the Holy Ghost (see note 4 at Ac 21:4), and was more than willing to lay down his life for the sake of the Jews (Ac 21:13). This illustrated his great love for the Jewish people as he was describing here.