'Tis a strange mystery, the power of words!
Life is in them, and death. A word can send
The crimson colour hurrying to the cheek.
Hurrying with many meanings; or can turn
The current cold and deadly to the heart.
Anger and fear are in them; grief and joy
Are on their sound; yet slight, impalpable:--
A word is but a breath of passing air.
Letitia Elizabeth Landon
http://www.poemhunter.com/poem/the-power-of-words/