24-WATCH lest the natural zeal of mortal mind cause you to believe that you can grow spiritually, or spiritualize your thought, in any way than by right thinking, or the effort to practice Christian Science in healing. When the effort to think right ceases, growth ceases. This watching point is necessary because of the prevalence of the belief that the study of the Bible and Science and Health brings man growth in the understanding of Truth. Does the study of a book on flying enable a man to fly? It tells him the theory, but he must put it into practice, and practice alone will bring the ability to fly. The study of the Bible and Mrs. Eddy's writings is essential, but it avails little unless it is followed by practice.