John Chrysostom
Since the Apostle had said, "I have no place in these regions," and, "for many years I have had a desire to come to you" (Rom 15:23), while he still had to delay, he explains why he cannot yet come to them. He does this lest the Romans should think he is mocking them, and says, "I am going to Jerusalem." Yet in speaking of the reason for his delay, the Apostle seems to have something else in view. He wishes to move them to almsgiving and make them more zealous in it. If this had not been his concern, it would have been enough for him to say, "I am going to Jerusalem." But now he adds the reason for this journey: "I am going," he says, "to minister to the saints." See with what dignity he uses his expressions.
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He did not say, "I am going to carry alms," but, "I am going to minister." If Paul ministers, consider how important this is. The teacher of the whole world takes on the labor of carrying offerings. Though he intended to travel to Rome and greatly desired to see the Romans, he nevertheless prefers the former to the latter.