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To comprehend a man's life, it is necessary to know not merely what he does but also what he purposely leaves undone. ... There is a limit to the work that can be got out of a human body or a human brain... And he is a wise man who wastes no energy on pursuits for which he is not fitted...... And he is till wiser who, from among the things that he can do well, chooses and resolutely follows the best......