In spite of whatever wisdom we may have; we can make a mistake if we have no control over our words. And we can easily find examples of this truth; those who talk much have less power than those who talk little. For a talkative person may not be able to express an idea in a thousand words which those who are masters of silence express in one word. ... What gives power over words? What gives the power that can be attained by silence? The answer is: it is will power which gives the control over words; it is silence which gives one the power of silence. It is restlessness when a person speaks too much. The more words are used to express an idea, the less powerful they become. It is a great pity that man so often thinks of saving pennies and never thinks of sparing words. It is like saving pebbles and throwing away pearls. An Indian poet says, 'Pearl-shell, what gives you your precious contents? Silence; for years my lips were closed.'
The mystic sees another significance of the mouth than for it to be a receptacle of food and drink. Through the mouth words of wisdom are expressed, sacred words repeated. Therefore the mouth is likened to a shell from which pearl-like words become manifest. As by the opening of the mouth words are expressed so by the closing of the mouth the word is drawn within, which becomes a living word compared with all other words, which are lost after once they are spoken.

-SANGITA SHAGAL