Bad thoughts never hurt anyone ... but you

I was listening to The Secret on the way home and loved this thought:

Your negative thoughts never hurt anyone but yourself.

How many times have you complained about someone, sworn at the driver in front of you or fumed about the rude customer service rep?  All those negative thoughts didn't hurt the people you were mad at at all - those thoughts just put you in a bad mood and probably started a spiral of negativity for the rest of the day.