"To some extent punctuation is sound that you do not hear, a pause that implies the presence of withheld sound.  To some extent, then, language is as dependent upon the unspoken as the spoken, and the rhythm of silence as well as of sound.  In that context, however, silence involves merely a pause of sound in which sound is implied but withheld.  Inner sound deals primarily with that kind of relationship.  Language is meaningful only because of the rhythm of silence upon which it rides." —Jane Roberts, The Nature of the Psyche

(Thanks, Tamara!)