"For I long to see you, that I may impart to you some spiritual gift, to the end you may be established; (12) That is, that I may be comforted together with you, by the mutual faith both of you and me."
Paul's letter to the Romans was written from Corinth during his 3rd visit there in A.D.60. It is addressed "To all that be in Rome, beloved of God, called to be saints:" (Rom.1:7).

Paul had not been to Rome but assures the believers there that they are continually mentioned in his prayers, this being a way in which he serves God with his "spirit in the gospel of His Son" (Rom.1:9). Furthermore, Paul makes very specific requests when he asks God for the opportunity to travel to Rome "by any means now at length", and also that he "might have a prosperous journey", (Rom.1:10). Sometimes we can find ourselves praying prophetically, using words that achieve a greater significance when answers arrive, like Paul's did with the means of his prosperous journey being his arrest and deportation to Rome for trial as a Roman citizen at the government's expense and with a military escort.(Acts 26:32).
Paul writes to Rome about the cause of his delay in coming to see them in person. His obedience to God's will is the cause of his delay. He would only go to Rome if God gave him leave from his work of planting churches and preaching in places where Christ was unknown;(Rom.15:20,21,22,23,24). We learn to seek the things of Christ more than our own will, giving special priority to ministrations which "much hinder us" in the pursuit of desires which, although from the Holy Spirit, are for a later time;(Rom.1:10,11,12,13).
Habakkuk 2:3 "For the vision is yet for an appointed time, but at the end it shall speak, and not lie: though it may tarry, wait for it; because it will surely come, it will not tarry."
Instead of allowing ourselves to become frustrated by divine
"a yearning to fellowship with those of like faith, in order to liberally share something given freely by the Holy Spirit to reinforce them."