The Gospel furnishes an exhaustless supply of topics. Every minister should, however, use great care to secure copiousness and variety of matter and illustration. The best means are such as these: 1. The constant, careful study of the Bible itself. Its words are the words of God, living and powerful. "They are spirit, and they are life" (John vi. 63); and the pastor who makes this Divine book his chief study has a mind filled, not with the feeble, evanescent thoughts of man, but with the quickening, eternal thoughts of God. The difference is world-wide between a sermon filled with God's thoughts and delivered as God's Word--a Divine message to men--and one which is a philosophical discourse wrought out of the preacher's own mind, and resting its authority on the mere force of human reasoning; and this difference is not simply in the unspeakably greater power of the former to stir and save the souls of the hearers, but also in the ever-increasing power of the preacher in sermon preparation, arising from the absolute inexhaustibleness of the materials for such a sermon. Some able and laborious men early exhaust themselves and fail of richness and power in the pulpit because their sermons are spun out of their own brain rather than from God's Word. They draw from the finite instead of the infinite fountain, and the waters necessarily fail. 2. A rich personal religious experience. All hearts are essentially alike, and he will best know other hearts who most truly knows his own. The power of a pastor depends largely on his knowledge of the heart and its experiences under the influences of the Gospel. This is more than a knowledge of human nature as delineated in Shakespeare and works of fiction, valuable as this is; it is a knowledge of the human soul under the power of sin and of the Holy Spirit, as its experiences are delineated in the Bible and in the religious life and are realized in his own soul. 3. An intimate acquaintance with the religious state of the individuals composing his own congregation in their special tendencies, temptations, and experiences. Almost every religious conversation will suggest new topics of living interest for sermons. 4. Habitual reading of the best religious authors, especially works on theology, exegesis, and experimental religion. 5. A careful preservation of texts, subjects, trains of thought, and illustrations, by noting them down as they occur. These are continually presenting themselves in the social meeting, in pastoral visits, in reading, and in reflection. No man can afford to lose these. They should be preserved to enrich and make effective the work of the pulpit, and so preserved as to be readily utilized; for one may have large accumulations of such materials, but if they are not grouped under appropriate headings and made easily accessible, they may be comparatively useless, because eluding the search at the moment of need.