“The melodic curves of speech are an expression of the complete organism and of all phases of its spiritual activities. They demonstrate whether a man is stupid or intelligent, sleepy or awake, tired or alert. They tell us whether he is a child or an old man, whether it is morning or evening, light or darkness, heat or frost, and disclose whether a person is alone or in company. The art of dramatic writing is to compose a melodic curve that will, as if by magic, reveal immediately a human being in one definite phase of his existence.”