I just finished all 12 pages of this thread. Pretty good stuff here.
I'll add three of my favorites.
"Be careful of the man who only owns one gun. He probably knows how to use it." -- Louis L'Amour
"If you find yourself in a fair fight, your tactics suck." -- Col. Jeff Cooper, USMC
"Two of the greatest gifts we can give our children are roots and wings." -- Hodding Carter. (Carter did not take credit for this. He ascribed the words to an unnamed wise woman.)