When you say nothing, you say something. When you sit on your hands, you speak loudly. People who are mute often speak the loudest, and radiating presence and charisma often requires no words.
Communication involves the interplay of both verbal and non-verbal elements. Pictures in the mind, pictures outside the mind, words, phrases, gestures, presence, charm, action, reaction: these are the stars and planets in the cosmos of communication.
But it should be said that effective communication is often a matter of proper attitude and not simply high volume.