1 Corinthians 7:11

But and if she depart, let her remain unmarried or be reconciled to her husband: and let not the husband put away his wife (KJV)

Then: Paul turns from the ideal to the practical "What if?" This verse presents a second-level ideal. Paul does not want members of the church to be tempted and slip back into the promiscuous Corinthian culture where women often initiated divorces. If the desire of the divorcée is to attain a situation in which she can better serve Christ, the way to do that is remain unmarried.

Now: Obviously, this advice is not an overview or summary of Paul's vision for Christian marital relationships (Hays, p. 111). They are snippets. Even though we can only guess what the Corinthians' original questions were, Paul's answers give solid standards for living the Christian life.

Extra source: First Corinthians by Richard B. Hays (John Knox Press, 1997) on line at http://books.google.com/books?id=M_PC0PAs3VYC&dq=1+Corinthians+and+Richard+B.+Hays&printsec=frontcover&source=in&hl=en&ei=2oPcStDCIIvf8Aaq0Ki3BQ&sa=X&oi=book_result&ct=result&resnum=11&ved=0CCMQ6AEwCg#v=onepage&q=1%20Corinthians%20and%20Richard%20B.%20Hays&f=false