On http://creativeclutch.com/creative/if-a-is-a-success-in-life-then-a-equals-x-plus-y-plus-z-work-is-x-y-is-play-and-z-is-keeping-your-mouth-shut-albert-einstein/

“If A is a success in life, then A equals X plus Y plus Z. Work is X; Y is play; and Z is keeping your mouth shut.” ~Albert Einstein