I know something about you without knowing you. I bet you spend A LOT of time in your head. You know, thinking, worrying, stressing, freaking out -- call it whatever you want. I call it a preoccupied mind. And with what?99% of your thoughts are useless.
William James, once the leading psychologist in America, and one of the founders of the philosophical school of pragmatism, put it best: "A great many people think they are thinking when they are merely rearranging their prejudices."
Pragmatism believes that the mind is a tool. Your mind should work for you, not against you. People who don't master their minds, don't believe it's possible.
They say: "I can't help but thinking these things."