You are a consistent follower of Rule One, so you always carry a gun. And since you are not merely a gun owner, but instead are actually prepared to defend yourself, you also follow Rule Two, and have trained sufficiently (and have kept in training sufficiently) to have at minimum a solid grounding in the fundamentals of shooting and gun-handling while also acquiring the requisite knowledge of the law with respect to use of force, and use of lethal force.
So what’s the third Rule?
It’s quite simple, really, even though this is the situation where the largest number of people will create the most ridiculous rationalizations to defend their emotional investment in a piece of equipment.
Rule Three of Concealed Carry: Carry the most effective tool that you can.