[12]
A boy therefore must
learn both the peculiarities and the common characteristics of letters and must know how they are
related to each other. Nor must he be surprised
that scabillum is formed from scamnus or that a
double-edged axe should be called bipennis from
pinnus, “sharp”: for I would not have him fall into
the same error as those who, supposing this word to
be derived from his and pennae, think that it is a
metaphor from the wings of birds.
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