Verses 8-12 :8 "Now I say that Jesus Christ was a minister of the circumcision for the truth of God, to confirm the promises made unto the fathers: 9 And that the Gentiles might glorify God for his mercy; as it is written, For this cause I will confess to thee among the Gentiles, and sing unto thy name. 10 And again he saith, Rejoice, ye Gentiles, with his people. 11 And again, Praise the Lord, all ye Gentiles; and laud him, all ye people. 12 And again, Esaias saith, There shall be a root of Jesse, and he that shall rise to reign over the Gentiles; in him shall the Gentiles trust."         

In this passage, Paul sets forth the relationship of the ministry of Christ both towards the Jews and towards the Gentiles.  He begins with the Jews, telling us that Jesus Christ was a minister of the circumcision for the truth of God, to confirm the promises made unto the fathers.  Time and again, we read in the gospels where Jesus would say, "it is written."  Also, the gospels declare concerning the works of Christ: "this was done, that it might be fulfilled…"  Jesus said in Matt. 5:17 "Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. 18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled."  Jesus came and fulfilled the promises God made unto the fathers and ministered this to the Jews.           

Furthermore, Jesus came to minister to the Gentiles that his mercy to them might be glorified according to that which was promised in the Old Testament: "And that the Gentiles might glorify God for his mercy; as it is written, For this cause I will confess to thee among the Gentiles, and sing unto thy name.  And again he saith, Rejoice, ye Gentiles, with his people.  And again, Praise the Lord, all ye Gentiles; and laud him, all ye people.  And again, Esaias saith, There shall be a root of Jesse, and he that shall rise to reign over the Gentiles; in him shall the Gentiles trust."  While this precious truth concerning the Gentiles was not understood until after the death, burial, and resurrection of Christ, nevertheless, we greatly rejoice because of it. 

Verses 13, 14  "Now the God of hope fill you with all joy and peace in believing, that ye may abound in hope, through the power of the Holy Ghost. 14 And I myself also am persuaded of you, my brethren, that ye also are full of goodness, filled with all knowledge, able also to admonish one another."         

Believing on the Lord Jesus Christ and believing his word should bring great joy and peace unto us.  If what we believe does not give us joy and does not give us peace, then we have probably been deluded into believing a lie.  When we believe the truth, we receive from the God of hope, joy and peace in our heart and mind.  In addition, when we believe the truth and grow in our knowledge of God's word, we also abound in hope.  This hope is the result of believing the promises of God and knowing that by the power of the Holy Spirit these promises will be fulfilled.          

"And I myself also am persuaded of you, my brethren, that ye also are full of goodness, filled with all knowledge, able also to admonish one another."  We usually are persuaded of something because we have the evidence.  Paul was persuaded of the brethren at Rome that they were full of goodness, filled with all knowledge, and able also to admonish one another.  He was persuaded of these things because he had the evidence that it was so.  This teaches us that we are to be full of goodness, filled with all knowledge, and able to admonish one another.  Furthermore, these things should be so much a part of our lives that others may see them and be persuaded these things are true of us also.