" To lead a disciplined life, you have to be willing to put off pleasurable activities and positive experiences in order to first complete the tasks you need to do and reach your goals. When you choose to get the hard bits out of the way first, you achieve greater gains in the end and become better able to guiltlessly enjoy the rewards waiting for you. "

― Peter Hollins , The Science of Self-Discipline: The Willpower, Mental Toughness, and Self-Control to Resist Temptation and Achieve Your Goals