A Box of Words

A box of words, stood alone,
high up on the shelf.
Words that had been used before
in another way or else,
some that were always hidden,
never being brought to light.
For they were forbidden words,
to be kept locked up tight.
Mean and cruel words, they were
causing heart ache, when
used in strings, almost everywhere.
What words are they, I hear now?
Blasphemous words, you say to me.
Well please explain how,
the words I love to write with Pen,
on a ruled, bound up book,
when I am writing now,
the last time I did look.