It's a Heidi thing...

All I really need to know about how to live and what to do and how to be, I learned in kindergarten. Wisdom was not at the top of the graduate-school mountain, but there in sand-pile at Sunday school. These are the things I learned:
Share everything.
Play fair.
Don’t hit people.
Put things back where you found them.
Clean up your own mess.
Don’t take things that aren’t yours.
Say sorry when you hurt somebody.
/…/
Take any of these items and extrapolate it into sophisticated adult terms and apply it to your family life or your work or your government or your world, and it holds true and clear and firm. Think what a better world it would be if /…/ all governments had as a basic policy to always put things back where they found them and to clean up their own mess.

(Robert Fulghum „All I really need to know I learned in Kindergarten” Ballantine Books 2004)