in witchcraft, magic is performed most often by making objects, through symbolism and spiritual charging, into sympathetic links to the desires, forces and subject of the spell. then deploying those items in a way to draw or repel the intended result from the spells target.
words bare a sympathetic link to the concepts they represent, be they written or spoken. thusly, words are often used as a foundation for a working. the incantations and words of power are the glue that marry the different parts of the ritual into a single magical working. they turn an ordinary mundane act into a magical one.