The word ‘fruit’ reminds us of John 15: Christ instructing his disciples that he desires that they should all bear fruit. There's always been a controversy about John 15.
The unselfishness of the apostle Paul! Every verse from 8 to 13 exudes unselfishness – praying for others, considering what he could give to them. He must give them something. You know people who are like that. Every time you talk to them they give you something. They think of something to give you. The apostle was like that. ‘I just long to give you something to help you.’ That is the spirit of the Christian, the new nature that is given to us. And the apostle Paul prays and works and longs and hopes to go so that he can strengthen and add to those persecuted believers in that vast capital city of Rome.
So two things we have seen which motivate the apostle Paul. First of all, he is moved and motivated by a desire to establish Christians in the faith. He is not the kind of evangelist who will rest content at dashing in and out of places, hopefully seeing people converted. He longs also to establish the converted, the people of God, so that they can really stand, so that they have depth and serve the Lord.