It's a favorite aphorism of U.S. Supreme Court Justice Stephen G. Breyer ; I've heard him use it 2, maybe 3 times, so it's not surprising the phrase has a life on the web. Here it is:
"The working life of the Supreme Court justice is reading briefs and writing opinions. So a lot of it is spent here at the desk, with my word processor. I usually say to students what I told my son when he was growing up: If you do homework very well, you will get a job where you can do homework the rest of your life ."