Hávamál - Stanza 125 (The Counsel of Óðinn the One-Eyed)

I counsel you, Loddfafnir,
if you'll take my advice,
you'll profit if you learn it,
it'll do you good to remember it:
Don't speak even three words
with a man worse than you.
Often the better man will lose
when the worst man fights him.

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