that we should believe in the name of his Son Jesus Christ, and love one another, ? We are not commanded to preach the gospel but to contend earnestly for the faith not as evangelists, but as providing the examples (like loving one another) of the true gospel.
Well, believing in the name of Jesus can give one power to become a son of God (i.e. to become saved). The apostle John says,
"But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:" (John 1:12).
This was a commandment given to the disciples (followers) of Jesus Christ. For John also says,
"And this is his commandment, That we should believe on the name of his Son Jesus Christ, and love one another, as he gave us commandment." (1 John 3:23).
In addition, Jesus says,
"And he said unto them, Go ye into all the world, and preach the gospel to every creature." (Mark 16:15).
19 "Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
20 Teaching them to observe all things whatsoever I have commanded you..."
(Matthew 28:19-20).
As mentioned in 1 John 3:23, these commandments would include to love one another (i.e. the brethren - see 1 John 2:10, 1 John 3:10, 1 John 3:15).
Note: Yes, we are also commanded to love our neighbor (i.e. the poor or everyone), and we are also commanded to love our enemies, as well.
You said:
To love one another is the second greatest of all commandments but what does that have to do when Paul said he has already preached the gospel?
Paul defines what he means by fully preaching the gospel in the previous verse.
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." (Romans 15:18-19).
Paul fully preached the gospel of Christ by speaking by the power of the Spirit of God and by which Christ has wrought in him by Paul's words and deeds so as to make the Gentiles obedient. We see elsewhere in Scripture, Paul says, God has chosen us to salvation through the Sanctification of the Holy Spirit (i.e. the process of living holy) and in belief of the truth (i.e. believing God's Word) as a part of God's call to for us to believe in the gospel (i.e. to believe in Jesus).
2 Thessalonians 2:13-14 says,
13 "...God hath from the beginning chosen you to salvation through sanctification of the Spirit and belief of the truth:
14 Whereunto he called you by our gospel,"
Paul says in another place, that he is not ashamed of the gospel of Christ for it is the power of God unto salvation to everyone who believes ..... FOR THEREIN is the righteousness of God is revealed! The Just shall live by faith.
Romans 1:16-18 says,
16 “For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to everyone that believeth; to the Jew first, and also to the Greek.
17 For therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith."
The righteousness of God is revealed by believing in Jesus for the forgiveness of our sin and by then living holy or by living by faith. For we are chosen by God for salvation through the Sanctification of the Spirit which is a part of God's call to believe the gospel (believe in Jesus).
If you were to read the words of Paul to the Gentile churches, you would see that he spoke about how what he had written should be regarded as the Lord's commandments (1 Corinthians 14:37). This is why Romans 15:18 says his words and deeds done worked by Christ and the Holy Spirit in Paul was to make the Gentiles obedient. Paul commanded things for the Gentiles to do so as to make them obedient to God. One such command, is that Paul says, "Owe no man any thing, but to love one another: for he that loveth another hath fulfilled the law. For this, Thou shalt not commit adultery, Thou shalt not kill, Thou shalt not steal, Thou shalt not bear false witness, Thou shalt not covet; and if
there be any other commandment, it is briefly comprehended in this saying, namely, Thou shalt love thy neighbour as thyself. Love worketh no ill to his neighbour: therefore love
is the fulfilling of the law." (Romans 13:8-10). This is all a part of Paul fully preaching the gospel of Christ as mentioned in Romans 15:19. For verse 18 proceeds verse 19. Verse 18 is the definition of "fully preaching the gospel" as mentioned in verse 19.
However, it is wrong to say that all believers are not commanded to preach the gospel (i.e. the good news of Jesus Christ).
"And Jesus said unto him, No man, having put his hand to the plough, and looking back, is fit for the kingdom of God." (Luke 9:62).
You said:
What has that to do with fake preachers who want to money for telling that to people? We are not to charge money in exchange for our standard in the faith but to be honest and freely give from our Lord given knowledge. If we do not work and labor day and night neither do we eat. Preachers who are paid a salary are wolves in sheep's clothing. 1
Colossians 1:23;
1 Thessalonians 2:9;
1 Corinthians 15:1;
Romans 15:19
Nowhere does Romans 15:19 or even Romans 15 talk about money or any kind of financial support of the ministry.