it is very clear to me that when your brain works right, you work right, and when your brain is troubled, you are much more likely to have trouble in your life.
With a healthier brain, you are happier, physically healthier, wealthier, wiser, and just make better decisions, which helps you be more successful and live longer. When the brain is not healthy for whatever reason—such as a head injury or past emotional trauma—people are sadder, sicker, poorer, less wise, and less successful.