William MacDonald emphasizes the importance of the gifts given to the Church, specifically focusing on evangelists, pastors, and teachers, and their role in equipping the saints for ministry. He argues that the purpose of these gifts is to build up the body of Christ, enabling all believers to engage in Christian service rather than relying solely on a one-man ministry. MacDonald critiques the clerical system, asserting that it hinders the active participation of the congregation and obscures the headship of Christ. He advocates for a model where every member of the Church is involved in ministry, leading to rapid expansion and maturity of the faith. Ultimately, he calls for a return to the New Testament principle of the priesthood of all believers, where each individual is empowered to serve.