Unless students who are preparing for work in the cause of God are trained to speak in a clear, straightforward manner, they will be shorn of half their influence for good. Whatever his calling is to be, the student should learn to control the voice. The ability to speak plainly and distinctly, in full, round tones, is invaluable in any line of work, and it is indispensable to those who desire to become ministers, evangelists, Bible workers, or canvassers.