" John Boyd, a sort of warrior-monk who revolutionized Western military strategy in the latter half of the twentieth century, refused to take checks from defense contractors and deliberately lived in a small condo even as he advised presidents and generals. “If a man can reduce his needs to zero,” he said, “he is truly free: there is nothing that can be taken from him and nothing anyone can do to hurt him. "

― Ryan Holiday , Stillness Is the Key