" Getting your brain wired into little goals and achieving them, that helps you achieve the bigger things you shouldn’t be able to do,” he said. “It’s not just practicing the specific thing. It’s always making things more difficult than they should be, and never falling short, so that you have that extra reserve, that tank, so you know you can always go further than your goal. For me that’s what discipline is. It’s repetition and practice. "

― Roy F. Baumeister , Willpower: Rediscovering the Greatest Human Strength