The article is simple, basic, and true. AA calls it taking your own inventory rather than taking anyone else's. To me it means to focus on myself, on what it is that I want, feel, like, don't like, etc, and on what I need to improve. I stray from my own business every time I think and talk about what you need or what you're doing rather than think and talk about what I am experiencing. One way I develop the awareness to avoid mentally living someone else's life is by getting told directly or implicitly to mind my own business and getting rejected, which has helped me learn to stay in my own head and business rather than in someone else's head and business. I've learned that I'm a stranger in anyone else's business, and an intruder except when explicitly invited, and the invitation is usually for a specific issue and a short period of time, and it's important to not overstay the welcome. I want to be respectful of someone else's business and boundaries. I've learned that staying in my own business helps the other be more open in sharing their business, and we can meet.