Stoics believe that there are two kinds of things: those that are within our power to control, and those that are not. Things that are within our power include our own thoughts, our choices, and our actions. Things that are not within our power include the weather, other people’s behaviour, and our past.

Link to The Photographer's Companion: Picture Perfect, A Beginner’s Guide to Photography:

https://www.amazon.com/Photographers-Companion-Picture-Beginners-Photography/dp/B0C5274WCX/ref=tmm_hrd_swatch_0?_encoding=UTF8&qid=&sr=