All I really needed to know, I learned from children's books

Do something to make the world more beautiful.
(Miss Rumphius)
Clean up the house when you're through playing.
(Cat in the Hat)
You don't have to fight if you don't want to.
(The Story of Ferdinand the Bull)
We're all meant to need each other.
(Missing May)
Stay golden.
(The Outsiders)
If you think you can, you can.
(The Little Engine That Could)
Don't leave home without your purple crayon!
(Harold and the Purple Crayon)
Eat a balanced meal every day.
(Bread and Jam for Frances)
There's no place like home.
(The Wizard of Oz)
Never eat someone's else's vegetables.
(The Tale of Peter Rabbit)
It doesn't matter how small you are.
(The Borrowers)
It doesn't matter how big you are.
(The BFG)
Don't cross the street without your mother!
(Make Way for Ducklings)
Never eat the last piece of the puzzle!
(Curious George Goes to the Hospital)
Ole Golly is right. Sometimes you have to die.
(Harriet the Spy)
Be glad you live in a world where there are Octobers.
(Anne of Green Gables)
Expect all the summers to be magic ones.
(Gone Away Lake)

(Seen in the 1998 movie "You've Got Mail!", this apparently is from a poster published by Koen Book Distributors in 1997.)