The unnatural strain of a forced voice in an unnatural tone wearies both preacher and people—A mistake has been made by many in their religious exercises in long praying and long preaching, upon a high key, with a forced voice, in an unnatural strain and an unnatural tone. The minister has needlessly wearied himself and really distressed the people by hard, labored exercise, which is all unnecessary. Ministers should speak in a manner to reach and impress the people. The teachings of Christ were impressive and solemn; His voice was melodious. And should not we, as well as Christ, study to have melody in our voices?—Testimonies for the Church 2:617. PaM 198.4
Preserve your usefulness by following the rules of proper speaking—Some of our most talented ministers are doing themselves great injury by their defective manner of speaking. While teaching the people their duty to obey God's moral law, they should not be found violating the laws of God in regard to health and life. Ministers should stand erect, and speak slowly, firmly, and distinctly, taking a full inspiration of air at every sentence, and throwing out the words by exercising the abdominal muscles. If they will observe this simple rule, giving attention to the laws of health in other respects, they may preserve their life and usefulness much longer than men in any other profession. The chest will become broader, and ... the speaker need seldom become hoarse, even by constant speaking.—Gospel Workers, 90. PaM 199.1
Train your voice in such a way that it may be used to its highest capacity—Let those who labor in word and doctrine strive to perfect themselves in the use of language. The voice is a great power, and yet many have not trained their voices in such a way that they may be used to their highest capacity. Jesus is our example. His voice was musical, and was never raised in high, strained notes while He was speaking to the people. He did not speak so rapidly that His words were crowded one upon another in such a way that it made it difficult to understand Him. He distinctly enunciated every word, and those who heard His voice bore the testimony that “never man spake like this man.”—The Review and Herald, March 5, 1895. PaM 199.2