People don't even realize the power the mind has over the body in the way you perceive things. Change your thoughts, change your reality. Words are powerful - every thought and every word we think has an effect on the body.
It is better wither to be silent, or to say things of more value than silence. Sooner throw a pearl at hazard than an idle or useless word; and do not say a little in many words, but a great deal in a few.