What is emphasised is the unrecognised power of words. the value of the individual word. We take words - language - very much for granted, just as we take our eyes, our power of vision for granted. But both are tremendously flexible and wide-ranging powers - which have hardly been described in any complete way, never mind explained.The paper is intended to do two main things. to categorise and illustrate the power of words, the different roles which language plays. Second, to assess the relevance for each of the areas considered of the motor theory of language evolution and function. Language is a powerful instrument. It is used in many different ways and constitutes one of the principal forces controlling and forming human behaviour. Besides its most familiar and normally most discussed use, communication, language is important through its use in own's private thought, in science and in oratory, in poetry, in philosophy - and perhaps most remarkably in techniques of hypnosis.