The Emerson System treats the voice as a natural reporter of the individual, constantly emphasizing the tendency of the voice to express appropriately any mental concept or state of feeling. This treatise is a setting forth of methods and principles based upon this idea with a fuller elaboration of the relation of technique to expression. By concentration of every distinctive phase, synthesized by a vital motive aroused by the message spoken, the voice becomes musical, forceful, clear, vibrant in the fulfilment of its natural function. The voice is the most potent influence of expression, the winged messenger between soul and soul.