Hi Bandorman, just want to say welcome to the forums and secular connections.
I'm not an expert on stoicism by any means, but I enjoy reading Marcus Aurelius and reflecting on it. I also use the serenity prayer from time to time. I will sometimes say it kind of as a mantra ... especially at times when my mind gets "worked up" over something, but I realize that "something" is really not my business or it's something I have no control over.
Good to have you here!