And since nothing whatever happens to us outside our own brain; since nothing hurt us or gives us pleasure except within the brain, the supreme importance of being able to control what goes on in that mysterious brain is patent

And since nothing whatever happens to us outside our own brain; since nothing hurt us or gives us pleasure except within the brain, the supreme importance of being able to control what goes on in that mysterious brain is patent (Arnold Bennett, How to Live on 24 Hours a Day)