To love what you do and feel that it matters — how could anything be more fun?
Katharine Graham (1917-2001) American newspaper publisher
In “The Power That Didn’t Corrupt,” Ms. Magazine (Oct 1974)
More discussion of this quotation's origins here: To Love What You Do and Feel That It Matters—How Could Anything Be More Fun? – Quote Investigator.
Sometimes misquoted as "how could anything else be more fun".