Romans 15:13-21 - Paul's Testimony

Romans 15:13 (KJV)
¹³ 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.

As Paul came to the end of his letter to the Romans he gave his readers a blessing, that God would fill them with all joy and peace, so that by faith they would abound in hope through the power of the Holy Spirit (verse 13).

Romans 15:14-21 (KJV)
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.
¹⁵ Nevertheless, brethren, I have written the more boldly unto you in some sort, as putting you in mind, because of the grace that is given to me of God,
¹⁶ That I should be the minister of Jesus Christ to the Gentiles, ministering the gospel of God, that the offering up of the Gentiles might be acceptable, being sanctified by the Holy Ghost.
¹⁷ I have therefore whereof I may glory through Jesus Christ in those things which pertain to God.
¹⁸ For I will not dare to speak of any of those things which Christ hath not wrought by me, to make the Gentiles obedient, by word and deed,
¹⁹ Through mighty signs and wonders, by the power of the Spirit of God; so that from Jerusalem, and round about unto Illyricum, I have fully preached the gospel of Christ.
²⁰ Yea, so have I strived to preach the gospel, not where Christ was named, lest I should build upon another man's foundation:
²¹ But as it is written, To whom he was not spoken of, they shall see: and they that have not heard shall understand.

He then stated that he was persuaded that the Roman believers were full of goodness, filled with all knowledge and were able to admonish one another (verse 14). Nevertheless, he had written to them boldly, as a reminder, because of his calling from God (grace) that he should be the minister of Yeshua the Messiah to the Gentiles (verses 15 & 16). He ministered the Gospel of God so that the Gentiles might be acceptable to God, having been sanctified by the Holy Spirit.

He therefore gloried through Messiah Yeshua in those things which God had accomplished (verse 17). However, he didn't dare to speak of any of the things which Messiah had not wrought by him, through word or deed, to make the Gentiles obedient. In other words he would confine his speech to only the things that he had been concerned in, and not to others' ministries (verse 18). Through mighty signs and wonders, by the power of the Holy Spirit, he had fully preached the Gospel of Messiah from Jerusalem into Illyricum (verse 19). So, Paul preached the Gospel, not where others had preached so that he wouldn't build upon another man's foundation (verse 20). But as it is written in Isaiah:

Isaiah 52:15 (KJV)
¹⁵ So shall he sprinkle many nations; the kings shall shut their mouths at him: for that which had not been told them shall they see; and that which they had not heard shall they consider.

Paul brought the Gospel message to those who had not heard before (verse 21). Then they would see and understand.

Next, Paul would continue with his testimony.