He who reaps receives wages, and gathers fruit to eternal life; that both he who sows and he who reaps may rejoice together.
He's asking Jesus to go from Cana down to Capernaum, twenty miles, to heal his son. Of course, if you've got a son that's dying and you're the dad, you're going to be desperate. You're going to do your best if you feel that, "Here's a man that can help my dying son."