I appreciate Charles Spurgeon’s challenge here–particularly the words I’ve highlighted in bold font:
Preach very solemnly, for it is a weighty business, but let your matter be lively and pleasing, for this will prevent solemnity from souring into dreariness. Be so thoroughly solemn that all your faculties are aroused and consecrated, and then a clash of humor will only add intenser gravity to the discourse, even as a flash of lightning makes midnight darkness all the more impressive. Preach to one point, concentrating all your energies upon the object aimed at. There must be no riding of hobbies, no introduction of elegancies of speech, no suspicion of personal display, or yon will fail. Sinners are quick-witted people, and soon detect even the smallest effort to glorify self. Forego everything for the sake of those you long to save. Be a fool for Christ’s sake if this will win them, or be a scholar, if that will be more likely to impress them. Spare neither labor in the study, prayer in the closet, nor zeal in the pulpit. If men do not judge their souls to be worth a thought, compel them to see that their minister is of a very different opinion.
Charles H. Spurgeon, Lectures To My Students (pp. 344-345). Fig. Kindle Edition.