"You live in the 'mental' environment you create. When your thoughts and feelings are miserable, you live in a self-created miserable environment. When you make sure your thoughts and feelings are positive and uplifting, or compassionate and charitable, you live in a healthy mental environment. It's completely up to you."This is from an e-book by Paul Friedman that I am reading and finding extremely enjoyable and enlightening.
Choosing a healthy mental environment,
The conscious act of thinking about one's thoughts in a different way changes the very brain circuits that do the thinking.