Jessie Penn-Lewis emphasizes the transformative power of the Cross in the life of a believer, illustrating how the Apostle Paul viewed his identity as fundamentally changed through Christ's death. She explains that the love of Christ constrains believers to live not for themselves but for Him, marking a shift from a self-centered existence to one centered on Christ. This change of center is crucial for understanding the believer's new identity as a 'new creation' in Christ, which requires a deep, experiential understanding of the Cross. Penn-Lewis argues that true freedom and authority over sin come from recognizing and embracing this new identity, as the Holy Spirit works within to create a new personality aligned with Christ. The message calls for believers to continually apply the Cross in their lives, leading to ongoing transformation and growth.