Whatever Negative thoughts or doubts I have in my mind, when I sit down and meditate while concentrating visually on a single object of devotion, the static in my mind clears and the negative, angry, doubtful feelings dissipate like fluffy clouds. Positivity and resourcefulness take their place! Try it!
nam myoho renge kyo. (& there are others, too! most religions)
you might want to check out sites like www.sgi-usa.org