Throughout my career, I have discovered and rediscovered a simple truth.It is this: the ability to concentrate single-mindedly on your most important… - Brian Tracy

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Throughout my career, I have discovered and rediscovered a simple
truth.It is this: the ability to concentrate single-mindedly on your
most important task, to do it well and to finish it completely, is the
key to great success, achievement, respect, status and happiness in
life.