Speech is silver
And silence, they say, is gold.
But when bitter words remain
Unuttered
Till they are forgotten,
Duels and wars remain
Unfought
Till the reason is forgotten,
And peace remains
Untouched
Till the humans evolve,
Silence seems
To be more precious than even diamond.

Jasbir Chatterjee

http://www.poemhunter.com/poem/silence-24/