Evangelist James Miller shares his personal experience of fasting for 28 days without food, only consuming liquids, during which he continued to preach multiple times a day. He emphasizes the importance of breaking a fast gradually with fresh fruit juices, diluted with water, and then transitioning to thin soup to avoid discomfort. Miller highlights the benefits of fasting, such as giving rest to the stomach and digestive tract, and the spiritual blessings and healing he received from God through fasting.