Dr. Robert Saucy discusses the importance of the Word of God to spiritual formation. He explains this through the analogy of food. In the same way that nutritious food produces proper and healthy growth of the body, Dr. Saucy explains, the Word of God nourishes and grows the spirit. By the same analogy, the unhealthy food of sin damages spiritual life. Dr. Saucy emphasizes the power of words to affect people's spirits.