Quotes from the Mad Dog himself:  
"I don’t lose any sleep at night over the potential for failure. I cannot even spell the word."

"Find the enemy that wants to end this experiment (in American democracy) and kill every one of them until they’re so sick of the killing that they leave us and our freedoms intact."

"Be polite, be professional, but have a plan to kill everybody you meet."
 
"There is nothing better than getting shot at and missed. It’s really great."
 
"The first time you blow someone away is not an insignificant event. That said, there are some assholes in the world that just need to be shot."

"You go into Afghanistan, you got guys who slap women around for five years because they didn’t wear a veil. You know, guys like that ain’t got no manhood left anyway. So it’s a hell of a lot of fun to shoot them. Actually it’s quite fun to fight them, you know. It’s a hell of a hoot. It’s fun to shoot some people. I’ll be right up there with you. I like brawling."  

Word.