An Olympic Athlete Trainer says this----
There are four negative feelings or thoughts that produce toxic chemicals in the brain. They are Hate, Greed, Fear, and Jealousy. To get his athletes to do better, he says they must change these to Love, Generosity, Courage, and Praise.
He claims that service to others is one of the best ways to move into the healthy context. Doing this has proven to be effective in producing the winning edge.
Interesting discovery. Thoughts produce chemicals, and positive thoughts produce positive chemicals. Of course, there is a time for sorrow and vexation, but they must not dominate, or they will infect.