"I have come to believe that a Christian leader's greatest mentor are the dark, lonely times in which God marks our souls with that profound sense of our need for Him." Crawford W. Loritts, Jr.
I don't think we often praise "Dark and lonely times" as great mentors. But I am certainly learning more in these times than I have in other, more "bright and sunny" times. There comes a time when we finally realize we can do NOTHING w/o Him. It's a hard road getting there.
He works all things together for our good, even darkness and loneliness.