In my mind, there is nothing so illiberal, and so ill-bred, as audible laughter. Lord Chesterfield
If the world should blow itself up, the last audible voice would be that of an expert saying it can't be done. Peter Ustinov
If the pressure is getting to you, whistle. In a barely audible way. It's the best way I know of to let go of tension. Music gets your mind off the situation, and the act of whistling melts the tension out of your body. Fuzzy Zoeller
Words are but the vague shadows of the volumes we mean. Little audible links, they are, chaining together great inaudible feelings and purposes. Theodore Dreiser