Chapter 1 Summary The debate in science is between the mind being what the brain does versus the brain doing the bidding of the mind. The correct view is that the mind is designed to control the body, of which the brain is a part, not the other way around. Our brain does not control us; we control our brain through our thinking and choosing. We can control our reactions to anything. Choices are real. You are free to make choices about how you focus your attention, and this affects how the chemicals, proteins, and wiring of your brain change and function. Research shows that DNA actually changes shape in response to our thoughts. Stress stage one is normal. Stress stage two and stage three, on the other hand, are our mind and body's response to toxic thinking--basically normal stress gone wrong. Reaction is the key word here. You cannot control the events or circumstances of your life, but you can control your reactions.