Folks are talking about the 4 Rules. I was going to write a post about it, but then I realized that I already did that a year ago.
The short version is that the 4 Rules are elegant, but when you become dogmatic about them, they lose their meaning. An example of “good” use of Rule 1 is that you simply verify the condition of any gun that hasn’t been in your immediate control. If I set a competition gun down and walk away for 2 minutes, a week, whatever, I’m going to clear it before I dry fire again, just in case the bullet gremlins snuck a round in the chamber. The 4 Rules: They’re more like guidelines, anyway.