I've also begun reading a series of sermons on the book of Ruth by John Piper.
Piper says that the book of Ruth is "for people who wonder where God is when there are no dreams or visions or prophets. It's for people who wonder where God is when one tragedy after another attacks their faith. It's a story for people who wonder whether a life of integrity in tough times is worth it. And it's a story for people who can't imagine that anything great could ever come of their ordinary lives of faith."
He says that from Ruth and Naomi's story we learn that "Not only does God reign in all the affairs of men, and not only is his providence sometimes hard, but in all his works his purposes are for the good and happiness of his people. If anything this summer has fallen in on you to make your future look hopeless, learn from Ruth that God is right now at work for you to give you a future and a hope. Trust him; wait patiently. The ominous clouds are big with mercy and will break with blessing on your head."