[25]
But, it will be urged, to carry out such a task is
difficult and has never been accomplished. To
which I reply that sufficient encouragement for
study may be found in the fact, firstly, that nature
does not forbid such achievement and it does not
follow that, because a thing never has been done, it
therefore never can be done, and secondly, that all
great achievements have required time for their first
accomplishment.
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