We like to collect stuff. It's bad enough when our homes get so full of things that it "leaves their owner with no place to shit" as Marcus Aurelius joked. But we collect things in our minds as well. Grudges and stress can clutter the mind just like material things can clutter the home. Lego of the things which no longer serve you and ease that burden a little!
How do you decide what's worth holding onto, and what you need to let go of?