[20]
And indeed
even although geometricians, musicians and grammarians, together with the professors of every other
branch of knowledge, spend all their lives, however
long, in the study of one single science, it does not
therefore follow that we require several lives more
if we are to learn more. For they do not spend all
their days even to old age in learning these things,
but being content to have learned these things and
nothing more, exhaust their length of years not in
acquiring, but in imparting knowledge.
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