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" "Obstacles are necessary for success because in selling, as in all careers of importance, victory comes only after many struggles and countless defeats. Yet each struggle, each defeat, sharpens your skills and strengths, your courage and your endurance, your ability and your confidence and thus each obstacle is a comrade-in-arms forcing you to become better... or quit. Each rebuff is an opportunity to move forward; turn away from them, avoid them, and you throw away your future.
Augustine "Og" Mandino (12 December 1923 – 3 September 1996) was a "sales guru" and author, most famous for his book The Greatest Salesman in the World (1968).
Biography information from Wikiquote
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I will act now. For now is all I have. Tomorrow is the day reserved for the labor of the lazy. I am not lazy. Tomorrow is the day when the evil become good. I am not evil. Tomorrow is the day when the weak become strong. I am not weak. Tomorrow is the day when the failure will succeed. I am not a failure. I will act now.