Keep calm and carry on
I'm getting a wall plaque for my birthday tomorrow just like this (yes, I choose my birthday presents. Who doesn't?) It originated as a British poster in 1939 to improve morale in World War II, but went out of currency when the war ended. I think they should have kept it alive! I hope it will remind me to take all the deep breaths I need and to remember that life is mostly a marathon, not a sprint.