John Calvin on Romans 15:22-23

22. And on this account, etc. What he had said of his apostleship he applies now to another point, even for the purpose of excusing himself for not having come to them, though he was destined for them as well as for others. He, in passing, then intimates, that in propagating the gospel from Judea as far as to Illyricum, he performed, as it were, a certain course enjoined him by the Lord; which being accomplished, he purposed not to neglect them. And lest they should yet think that they had been neglected, he removes this suspicion by testifying, that there had been for a long time no want of desire. Hence, that he had not done this sooner was owing to a just impediment: he now gives them a hope, as soon as his calling allowed him.

From this passage is drawn a weak argument respecting his going to Spain. It does not indeed immediately follow that he performed this journey, because he intended it: for he speaks only of hope, in which he, as other faithful men, might have been sometimes frustrated. On this subject Wolfius says, “Paul’s journey to Spain was unknown to Origen and Eusebius; nor does it comport with the records connected with him. The Apostle, when freed from the chains of Nero, did not go to Spain, but to Asia; and there is no vestige of a Church founded by Paul in Spain. Basnage has carefully examined this subject as well as W. Wall in his critical Notes in English on the New Testament.” As is common in many things connected with antiquity, fathers later than Origen and Eusebius came to know of this journey, but how, it is not easy to know: and in process of time various particulars were discovered, or rather invented, in connection with this journey. It is something similar to the story of Peter being the founder of the Church of Rome. — Ed.