I just finished reading the book, In the Pit with a Lion on a Snowy Day, by Mark Batterson. It was really excellent. It is inspired by the story of Benaniah (one of David's bodyguards and later commander of Israel's army). The story of Benaniah begins with him chasing a lion into a pit on a snowy day and killing it. Mr. Batterson argues that if Benaniah had not done something counter intuitive/risky and had not chased a lion that he would have never gained David's recognition become David's bodyguard. The point of the book is that we should embrace God-ordain risks in faith. Sometimes our biggest opportunities look like very challenging problems.
I first heard about this book from the blog Missional Living. I read her review of this book a month or so ago. It is much better and more in depth than mine. I encourage you to read her review and then go read In the Pit with a Lion on a Snowy Day.