Has God asked you to do any thankless tasks? What were they, and how did they turn out?

This is a pretty hard question for me, I admit.  I'm having trouble thinking of one situation.  Surely something like this has happened to me.  I'm not sure if this is the greatest example, but twice before, and I'm enduring this situation now, is where I knew that God was telling me to move on with my life, eventhough I felt so much pull to wish for what I did have back.  Obviously, a task like this takes a lot of time to accomplish, and eventually, when the time is right, one day you wake up and everything is ok again without the thing you had before.