Reproduction is evidence your discipling program is beginning to multiply, because until you see what is emerging from this person in whom you’ve invested, you really don’t know if you’ve gotten through. Until you see the fruit of your discipling in reproduction, you’re not sure you’ve finished your work. That was always in the mind of Jesus from the beginning. He’s not just looking to the next generation; he’s looking to the generation beyond that generation and the generation beyond that. He’s looking always to the fulfillment of his plan to reach the world. In his mind, there’s no such thing as global missions as distinct from local missions. God loves every person in the world.
Discipleship without reproduction isn’t really discipleship. Disciple-makers put the effort into someone so it can spread further and faster.