William MacDonald emphasizes the distinction between the spirit and soul in the life of a believer, highlighting that the spirit connects us with God while the soul relates to our emotions and passions. He critiques the modern tendency to prioritize the body and soulish activities over spiritual matters, urging the church to focus on genuine worship, prayer, and service that glorifies Christ. MacDonald warns against the dangers of soulish practices that draw attention to self rather than God, and he calls for a return to spiritual integrity in the church's activities and outreach.