1 Corinthians 16:16

That ye submit yourselves unto such, and to every one that helpeth with us, and laboureth (KJV)

Then: The Corinthians aren't the only congregation Paul started. He has worked with many whom the Lord calls. Some of the Corinthians, with their problem of thinking one preacher better than another, may have not been as open as possible to Paul's missive bearers. They needed an extra bit of urging. So Paul praises Stephanas, Fortunatus and Achaicus giving them status. Paul hopes the letter bearers will be well received.

Now: When we get a house or home ready to receive visitors, we are so busy that we spend a lot of time thinking about our side of the work and not too much about the feelings of the ones who are coming. If we consider Paul's request we can also think about the problems the visitors are facing. That question, "Did you have a nice trip" takes on addded meaning. It's a part of keeping the Lord's commandment to be loving.