“You might not believe it… but you make the world a better place when you smile.”
Variant: The world is a better place when you smile
Source: The Guardian
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Nicholas Sparks 646
American writer and novelist 1965Related quotes
Source: As remembered by Don Redelmeir, Michael Lewis, "The Undoing Project: A Friendship that Changed the World". Penguin, 2016 (ISBN 9780141983035).

Presidential debate (28 October 1980) http://www.juntosociety.com/pres_debates/carterreagan.html
1980s

“If you want to make the world a better place
Take a look at yourself, and then make a change.”
Source: Song Man in the Mirror
Context: I'm starting with the man in the mirror
I'm asking him to change his ways
And no message could have been any clearer
If you want to make the world a better place
Take a look at yourself, and then make a change

“Find someone who makes you smile, because it only takes a smile to make a day better”
Source: The Devil and Miss Prym

“The point of life was to press on, to do the best you can, to make the world a better place.”
Source: Clear and Present Danger

[NewsBank, 03I, Science Guy Wants You to Ask, 'Why?', The Columbus Dispatch, Ohio, October 24, 2001, Connie A. Higgins]