T. Austin-Sparks emphasizes that true reproduction of life in Christ requires sacrificial yielding, as illustrated in John 12:24, where a grain of wheat must die to bear fruit. He explains that the essence of Christian life is not merely to exist for oneself but to propagate the life of Christ through self-denial and acceptance of His death. The church's growth is rooted in the living expression of Christ's life within believers, rather than through imitation or doctrinal systems. Sparks asserts that ministry arises from the life of Christ in individuals, and true church order is a manifestation of this divine life. Ultimately, the growth of the church is contingent upon living as life channels, allowing Christ's life to flow through them for reproduction and increase.