T. Austin-Sparks delivers a profound message to young Christians, likening the church to a jigsaw puzzle where each believer is a unique piece that fits into God's grand design. He emphasizes that every individual has a specific place and purpose within the body of Christ, and that true fulfillment comes from recognizing and accepting this role. Sparks highlights the importance of the headship of Christ in aligning believers and fostering unity, asserting that the Holy Spirit guides each person to their rightful position. He encourages Christians to embrace their experiences as part of God's intricate plan, ultimately leading to a complete and beautiful picture of the church. The sermon concludes with the hope that one day, believers will see the full design of God's work in their lives.