Might be this is the one I was thinking of?
[INDENT] I've always followed my father's advice: he told me, first to always keep my word and, second, to never insult anybody unintentionally. If I insult you, you can be goddamn sure I intend to. And, third, he told me not to go around looking for trouble.John Wayne
US movie actor & director (1907 - 1979) [/INDENT]
We do have a couple of threads with loads of Duke's Quotes,
including I am sure the one's in your link
Duke's Quotes
and
Duke's Movie Quotes