T. Austin-Sparks emphasizes the significance of growth as a criterion of livingness, contrasting the spontaneous growth of a healthy organism with the stagnation that occurs when life is limited or frustrated. He explains that true spiritual growth requires a margin of spiritual capital, which is maintained through rest and the proper appropriation of spiritual nourishment. Sparks warns against the dangers of superficial growth and stresses the importance of organic relatedness within the body of Christ, where each member's function is vital for the health of the whole. He illustrates that just as the human body thrives on interdependence, so too must the Church embody this principle to fulfill its divine purpose. Ultimately, he calls for believers to cultivate a vibrant spiritual life that fosters genuine fellowship and growth.