Ol Matthew was a nice fellow, no doubt. But I’m still going with: Be prepared, be polite, be professional, but be prepared to kill the next person you meet. semper fi
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Actually Matthew was quoting Jesus; and I agree with that quote. AND at the same time, be polite, be courteous, and have a plan to kill everyone you meet. Not contradictory. :-D
I left out “be alert.” When one is out and about, doing stuff of every sort, danger and threats come from weird places. The “walk softly, carry a big stick,” thing is also always in play.