
God not only made the institution of marriage, but He knows what's best to make it thrive. Sometimes marriages can get messy. Sin can creep it's way in and cause problems. Sometimes we can even settle for what is socially normal rather than looking at things from God's perspective.
In Ezra 9-10, Ezra deals with a marriage mess. But HOW he deals with it is just as important as THAT he deals with it.