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I never could have done what I have done without the habits of punctuality, order, and diligence, without the determination to concentrate myself on one subject at a time.

Charles Dickens (1872). “A Cyclopedia of the Best Thoughts of Charles Dickens”, p.216
I never could have done what I have done without the habits of punctuality, order, and diligence, without the determination to concentrate myself on one subject at a time.