While marked in the book, this was the closest I could find?
“To shrug it all off and wipe it clean—every annoyance and distraction—and reach utter stillness. Child’s play.” (5.2)
“II. How easy a thing is it for a man to put off from him all turbulent adventitious imaginations, and presently to be in perfect rest and tranquillity!”
“2. How easy a thing it is to put away and blot out every impression that is disturbing or alien, and to be at once in perfect peace.”
Marcus Aurelius (meditations)
A free copy of Marcus Aurelius Meditationsis available here.