Mental states trigger different parts of the brain. Mental states trigger different hormones in the blood stream.
There are several versions of a story, this one ascribed to the Cherokee.
There was a grandfather speaking with his grandson, telling of two wolves. “There are two wolves living inside me,” the grandfather explained. “They fight with each other, one is evil, one is good.
“The evil wolf uses anger, sorrow, fear, judgement, greed, self-pity, guilt, lies, false pride and ego.
“The good wolf uses love, serenity, hope, empathy, exploration, generosity, gratitude, truth, compassion, creativity and purpose.”
“In this fight between the two wolves,” the grandson asked, “which will win?”
“The answer is simple,” the grandfather replied. “The wolf that wins, is the wolf you feed.”
Which wolf are you feeding? It’s a shift in mental state.