With words one man can make another blessed, or drive him to despair; by words the teacher transfers his knowledge to the pupil; by words the speaker sweeps his audience with him and determines its judgments and decisions. Words call forth effects and are the universal means of influencing human beings.
introductory Lectures On Psychoanalysisby sigmund Freud
Words and magic were in the beginning one and the same thing, and even today words retain much of their magical power.
He that has eyes to see and ears to hear may convince himself that no mortal can keep a secret. If his lips are silent, he chatters with his fingertips; betrayal oozes out of him at every pore.