Who said "Being yourself is the best gift you can give the world."?

This quote is attributed to Snoopy.

Being yourself is the best gift you can give the world. - Snoopy

"Being yourself is the best gift you can give the world."

Snoopy

"I think I'm dying. Send for a doctor immediately!"

"Rats! Another day, another disappointment."

"Sometimes I lie awake at night and ask, 'Is life a multiple choice test or an essay?' Then a dog barks and I realize it doesn't matter."

"I love mankind. It's people I can't stand."