To write and speak correctly is certainly necessary; but it is not sufficient. A derivation correctly presented in the book or on the blackboard may be inaccessible and uninstructive, if the purpose of the successive steps is incomprehensible, if the reader or listener cannot understand how it was humanly possible to find such an argument....
If the mind is wearied by study, or the body worn with sickness,It is well to lie fallow for a while, in the vacancy of sheer amusement ;But when thou prosprest in health, and thine intellect can soar untired,To seek uninstructive pleasure is to slumber on the couch of indolence.martin farquhar tupper
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