David Wilkerson emphasizes that our facial expressions serve as a reflection of our inner state, declaring that our countenance reveals the joy or turmoil within us. He highlights how the presence of Christ in our hearts should positively influence our demeanor, contrasting the peace of a believer with the stress and worry that can harden one's face. Wilkerson encourages Christians to be mindful of the messages their faces convey to the world, as they can either reflect the love of God or the weight of sin and anger. He cites examples from scripture, including King David and Stephen, to illustrate how a transformed heart leads to a radiant countenance. Ultimately, he reassures believers of God's unconditional love and care, which should uplift their spirits and expressions.