It has been proven that negative thoughts can, indeed, contribute to muscular tension, high blood pressure, high cholesterol - even heart disease and immune weakness.
"Creative minds have always been known to survive any kind of bad training."
"The strength of my inner thoughts keep me from being the victim of other peoples negative thoughts"
Finest Quality 51 Degree 9" 24k Gold-plated Copper Meditation Pyramid for Healing
"All action results from thought, so it is thought that matter.
* I think that he is trying to tell you to keep thoughts positive. If you think about all of the horrible things that can go wrong...
“You can’t imagine just how much believing in negative thoughts is affecting your life…until you stop.”
Charles F. Glassman
A pessimist is a man who thinks everybody is as nasty as himself, and hates them for it.
George Bernard Shaw