A.B. Simpson emphasizes that we are God's workmanship, created for good works that He has prepared for us. He encourages believers to serve not in their own strength but by relying on Christ's resources and might. Simpson highlights the importance of faith in our work, even when we feel weak and helpless, assuring that God will provide the power and fruits of our labor. He draws on the metaphor of working in the wilderness, where true fruitfulness often emerges from barrenness. Ultimately, he calls us to walk and work by faith, leading to the salvation of souls and eternal fruitfulness.