There you go, condemning many of the greatest writers of our past. Longfellow anyone? So many happily quoted in Latin, or Greek, even French, rarely German, without a care, and without footnote translations.
Wouldn't it be fun if someone just saw a sentence in a foreign language and thought: what does that even mean? I think I'll find out.
But what about writing the one sentence in only one language? Is that not impolite to those who do not read that language, but can read the other? 😀