Romans 11:13-14 : But I speak to you that are Gentiles. Inasmuch then as I am an apostle of Gentiles, I glorify my ministry; if by any means I may provoke to jealousy them that are my flesh, and may save some of them. Though Paul was discussing at length the fate of the Jews, he would not have Gentile Christians think he was forgetting the Gentile people. He had been chosen as an apostle of the Gentiles, and he gloried in that ministry. He demonstrated that he was sent of God by the miracles he performed. He hoped that his preaching to the Gentiles and his miracles among them would stir some of the Jews to such a pitch of jealousy that they would so investigate the testimony concerning the Christ as to become believers in Jesus as the Christ.
By so doing he would be an instrument in saving those who believed his preaching. By teaching, backed up by a godly life, any Christian may be an agent in saving others. "Take heed to thyself, and to thy teaching. Continue in these things for in doing this thou shalt save both thyself and them that hear thee" (1 Timothy 4:16). Paul did not expect to save all the Jews, only some of them.