The Mesillas Yesharim says we have to ask ourselves the following question: What did our forefathers do that Hashem chose them? What did Abraham Avinu do? What did Yitzchak do? What did Yosef do that Hashem loved them so greatly?
We have to spend time everyday studying that. When we finally discover it, we have to say "I also want to do the same." -- Shir Hashirim 17 (#451)