A blunt sword will not cut; a dull sermon will not reach the conscience. The sword must be sharpened, and the sermon must be sharpened too. The preacher’s laziness or half-heartedness, want of earnest faith in Christ and earnest love to men, blunts the edge of his sermons. Ah! he needs to be sharpened himself; stirred up continually to fresh energy and communion with his Savior, and affectionate interest for his fellow-men. Nothing prevents dulness so effectually as energy and zeal. The snore from the pew is often only the echo of the snore from the pulpit.
Frederick R. Wynne, The Joy of the Ministry