A word is not a crystal, transparent and unchanging; it is the skin of
living thought and changes from day to day as does the air around us.
-Oliver Wendell Holmes.

The thing about words is, you never know whose mouths they've been in.
--Dennis Potter

Language is a very difficult thing to put into words.  --Voltaire

The problem with defending the purity of the English language is that
English is about as pure as a cribhouse whore. We don't just borrow
words; on occasion, English has pursued other languages down alleyways
to beat them unconscious and rifle their pockets for new
vocabulary. --James D. Nicoll