Accepting a new reality
You stepped in a pile of dog poop. Yikes!
How quickly can you accept this new reality?
Do you spend a few minutes stewing over how that horrible person didn't pick up after their dog? Do you berate yourself for not watching where you were walking? Do you fume over how going back home to clean your shoe will make you late to work?
Or, can you almost immediately think, "well, I wish that hadn't happened, but it did, so I'll deal with it".
The faster you can accept a new reality, the easier your life will be.
h/t David Cain