Romans 15:32

That I may come unto you in joy through the will of God, and together with you find rest. Now the peace of God be with you all. Amen.

That I may come unto you in joy ... refers to the projected acceptance on the part of the poor Christians in Jerusalem of the bounty provided by the Gentiles. If they accepted it (which they did), Paul would be relieved of anxiety on that score and would come "with joy." Hodge's discerning words on this passage are:

Paul seemed to look forward to his interview with the Christians in Rome, as a season of relief from conflict and labor. In Jerusalem, he was beset with unbelieving Jews, and harassed by Judaizing Christians; in most other places, he was burdened with the care of the churches; but at Rome, which he looked upon as a resting place, rather than a field of labor, he hoped to gather strength for the prosecution of his apostolic labors in still more distant lands.[22]

Now the peace of God be with you all ... Paul had asked them to pray for him; and some have thought that Paul here prays for them, not a long prayer, but one so rich and full of meaning that its single petition includes all others. Of course, this is a beautiful thought; but there are strong reasons for taking another view. This is another doxology, among many in this epistle; and a doxology differs from a prayer in three important particulars: (1) it is addressed to people, and not to God; (2) it does not contain or advocate any request or petition for the forgiveness of sins; and (3) it is not offered in the name of the Lord Jesus Christ.