“For everyone who calls on the name of the Lord will be saved.’ How then will they call on him in whom they have not believed? And how are they to believe in him of whom they have never heard? And how are they to hear without someone preaching? And how are they to preach unless they are sent? As it is written, ‘How beautiful are the feet of those who preach the good news!'” (Romans 10:13-15)
Paul expressed his hope that the Jews would hear and believe the gospel at some time in the future. He was aware that though they were zealous for the things of the Lord, their desires and sincerity were insufficient for salvation for they were self-righteous. They were proud of keeping the Law, proud of their morality, proud that they were better than every other race of people. Although they claimed to follow the Lord and do His will, they really stood in rebellion against Him. They needed to renounce their own righteousness and prejudice, repent and believe in the righteousness of Jesus. This is true of all people of all religions, including Judaism and nominal Christianity for most are based on righteousness by works not by faith. All who believe that their deeds and good works make them righteous and earn them a place in heaven are lost no matter how moral they seem or claim to be.
Therefore the Lord calls upon us to fulfill our calling through preaching the gospel to both Jew and Gentile, or in our case people we do not like or who we feel superior to. For in order to be saved, sinners must call on the name of the Lord and for that to happen they must know of the death and resurrection of Jesus. For that to happen some one must tell them just as someone told us, unworthy sinners though we were. God in His sovereign will has chosen believers to be that someone, to be His instruments to proclaim the gospel. Thus we are to preach to all that they might be saved. How are you being used as an instrument of God to preach to the lost? There is no greater task!