“To give up that control is to be left with “the constant gnawing sense of having had and lost some infinite thing.”38 A mentally troubled man—he would hang himself two and a half years after the speech—Wallace knew with special urgency the stakes involved in how we choose, or fail to choose, to focus our mind. We cede control over our attention at our own peril. Everything that neuroscientists have discovered about the cellular and molecular workings of the human brain underscores that point.”