Chapter 7 of The Master Plan of Evangelism is about reproduction. Jesus’ training of the 12 would not stay with the 12. Jesus would send out the 12 with others as the church to go out and do exactly what He had done in them. In other words, they were to reproduce what Jesus had done in them. This commission continues to propel us to reproduce in others what Jesus did in the disciples, and what Jesus has done in us by mentors in the church. Here is a small snippet from the Master Plan of Evangelism.
Jesus intended for the disciples to produce his likeness in and through the church being gathered out of the world. Thus his ministry in the Spirit would be duplicated manyfold by his ministry in the lives of his disciples. Through them and others like them it would continue to expand in an ever-enlarging circumference until the multitudes might know in a similar way the opportunity that they had known with the Master. By this strategy, the conquest of the world was only a matter of time and their faithfulness to his plan.
Jesus had built into his disciples the structure of a church that would challenge and triumph over all the powers of death and hell. It had started small like a grain of mustard seed, but it would grow in size and strength until it became a tree “greater than all the herbs” (Matt. 13:32; see Mark 4:32; Luke 13:18–19). Jesus did not expect that everyone would be saved (he recognized realistically the rebellion of men in spite of grace), but he did foresee the day when the gospel of salvation in his name would be proclaimed convincingly to every creature. Through that testimony his church militant would someday be the church universal even as it would become the church triumphant.
It was not going to be an easy conquest. Many would suffer persecution and martyrdom in the battle. Yet no matter how great the trials through which his people would pass, and how many temporal skirmishes were lost in the struggle, the ultimate victory was certain. His church would win in the end. Nothing could permanently prevail against it or be strong to its detriment, or hold out against it. (Matt. 16:18).
Coleman, R. E. (2006). The master plan of evangelism (pp. 89–90). Grand Rapids, MI: Revell.