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Get the Summary of Brian Tracy's No Excuses in 20 minutes. Please note: This is a summary & not the original book. Original book introduction: Most 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, investing, real-estate development, and management consulting.