One of the chief duties which [the Christian] will punctually and carefully fulfill is the duty of prayer. You will remember in the Book of Acts, when Saul the persecutor was converted by a special miracle, the sign given of his conversion was this: "Behold he prayeth." (Acts 9:11). Prayer is the breath of the soul. Just as breathing is the sign of life, prayer is the sign of the life of the soul.