What should bring a Christian more joy than success?

In Episode #87 of Jesus Said That, Pastor Ken and Pastor Kenny work through Luke 10:1–24, where Jesus sends out the seventy-two. Why does Jesus tell them to pray for workers and then immediately send them to work? What does it mean to be sent like lambs among wolves? How should Christians respond when people reject the message? And why does Jesus redirect the disciples after an incredibly successful ministry trip?
Most importantly, discover why success—even success for Jesus—should never be our greatest joy.