No Excuses: The Power of Self-DisciplineMost people think success comes from good luck or enormous talent, but many successful people achieve their accomplishments in a simpler way: through self discipline. Brian Tracy knows this firsthand: He didn't graduate from high school, and after working for a few years as a laborer, he realized he had limited skills and a limited future. But through the power of self discipline, he changed his life, achieving success in sales and marketing,