The wisdom of Miss Piggy:
If you are what you eat, eat what you like and you will like yourself.
Some others I like:
It is better to light a candle than curse the darkness.
In a world where you can be anything, be kind.
(Paraphrased) In 50 years, no one will care what car you drove, how big your house was, whether you had cool gadgets and fancy clothes, but children will remember if you made a difference in their lives.