[8]
But it is clearly
useless to take one or two cases, or even a hundred
or a thousand, since their number is infinite. It is
the duty of the teacher to demonstrate daily in one
kind of case after another what is the natural order
and connexion of the parts, so that little by little
his pupils may gain the experience which will enable
them to deal with other cases of the same character.
For it is quite impossible to teach everything that
can be accomplished by art.
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