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.
Og MandinoThere are two kinds of discontented in this world, the discontented that works and the discontented that wrings its hands. The first gets what it wants and the second loses what it has. There is no cure for the first but success and there is no cure at all for the second. The very worst of my vices and bad habits will abate of themselves if they are brought to an accounting every day.
Og MandinoThe weakest living creature, by concentrating his powers on a single object, can accomplish good results while the strongest, by dispersing his effort over many chores, may fail to accomplish anything.
Og Mandino