From JayG:

Having a permit to carry a firearm doesn’t make you a tough guy. It’s not a license to shoot off your mouth, nor is it permission to let your guard down and be careless because, hey, you have a gun. It’s a deadly serious proposition that means you have to man up, put on the big boy pants, and let the loudmouth think he won the battle of wits. You have to be prepared to humble yourself to the jackass that wants to be the center of attention. You have to be ready to walk away, and to hell with what anyone thinks.

Having that gun doesn’t make you invincible. It makes you liable. If a fight happens, your best bet is to be in a different time zone. You don’t want there to be any chance you could get caught up in the excitement and have to make a life-or-death decision. You need to keep a clear head, one unsullied by drugs, alcohol, or foolish pride. You have to be the better person, no matter what that little devil on your shoulder whispers into your ear.

I’d say it doesn’t apply to just guns. If you’ve got legit abilities to hurt someone (e.g. martial arts training), it’s the same thing.