“The difference between children and adults is that they're shorter - not dumber.”
Help us to complete the source, original and additional information
Mo Willems 7
American children's illustrator and writer 1968Related quotes
“The value of marriage is not that adults produce children, but that children produce adults.”

Interview on CNN's Crossfire http://www.animalrights.net/archives/year/2002/000094.html (2002); in response to Tucker Carlson's description of a PETA member campaigning directly to his four-year-old son outside a circus.
2002

“Is adult entertainment killing our children? Or is killing our children entertaining adults?”
As quoted in MarilynManson.com (2000).
2000s

Mr Brown's self-esteem issue - or, asks Theodore Dalrymple, does Gordon Brown really believe that he can solve the problems of the world? http://www.socialaffairsunit.org.uk/blog/archives/001326.php (January 24, 2007).
The Social Affairs Unit (2006 - 2008)

Quoted in "Origin of the Specious", Reason Magazine (July 1997) http://www.reason.com/news/show/30329.html.
1990s
" Children Really are Not People http://books.google.com/books?id=w0FnrZaKX7MC&q=%22Children+are+different+mentally+physically+spiritually+quantitatively+qualitatively+and+furthermore+they're+all+a+little+bit+nuts%22&pg=PA157#v=onepage," Please Don't Eat the Daisies, The Saturday Evening Post, 27 July 1957 http://books.google.com/books?id=0QkfAQAAMAAJ&q=%22Children+are+different+mentally+physically+spiritually+quantitatively+qualitatively+and+furthermore+they're+all+a+little+bit+nuts%22&pg=PA17#v=onepage
Please Don't Eat the Daisies (1957)