To share something. To assert something. To confess something. Something very different occurs when we speak than when we write. Something truly vital, truly dynamic occurs when we talk.
Words cease being a cerebral, symbolic system of arbitrary signs and carry a weight of emotion.
I have heard Hamlet performed by at least six different leading actors, including Richard Burton, Lawrence Olivier, Mel Gibson, Nicol Williamson, Keven Kline and Kenneth Branaugh. I have heard many different Ophelias, many different Claudius', many different Gertrudes. Each time the play is different. One actor might interpret a line with acerbity and fire, another more coolly, with insouciance and wit. Lines that had to be loudly declaimed in a theater may have been spoken sotto voce in a movie where a sensitive microphone enlarged the opportunities for interpretation.