Saw a comic recently (xkcd? old one?) where a person was visited by a muse, who said "Working hard and slacking are not the only two things there are in life"

Saw a comic recently (xkcd? old one?) where a person was visited by a muse, who said "Working hard and slacking are not the only two things there are in life" Reminded me to make plans for some of my personal time, not just piss it away.