T. Austin-Sparks explores 'The Mystery of the Gospel', emphasizing that the Gospel is more than its individual components like atonement and forgiveness; it is the fullness of God's redemptive plan through Christ. He argues that the current spiritual state of Christians reflects a need for a deeper understanding of the Gospel, which is rooted in the mystery of Christ's incarnation and the call to sonship. Sparks highlights that the conflict faced by believers is centered around their spiritual growth and maturity, which is essential for overcoming the challenges posed by the enemy. He asserts that the true essence of the Gospel is not merely about salvation but about becoming a living expression of God's nature through Christ in us. Ultimately, the sermon calls for a renewed apprehension of the Gospel to fulfill God's purpose in the world.

T. Austin-Sparks emphasizes the profound nature of the Gospel, referring to it as 'the gospel of the glory of the blessed God.' He explains that this Gospel encompasses not only salvation but also the mystery of God's eternal purpose, revealing the character of God as one of glory and righteousness. Sparks highlights that understanding glory is essential to grasping the fullness of the Gospel, which is linked to our calling and the hope of transformation into God's likeness. He encourages believers to see trials as opportunities for their faith to be tested and refined, ultimately leading to glory. The sermon concludes with the promise that through suffering with Christ, believers will be glorified together with Him.