Who said "Be brave, be kind, be true."?

This quote is attributed to Scooby-Doo.

Be brave, be kind, be true. - Scooby-Doo

"Be brave, be kind, be true."

Scooby-Doo Kindness

"Scooby-Dooby-Doo, where are you?"

"Ruh-roh!"

"Like, zoinks!"

"Let's split up, gang!"

"A good man treats his wife with respect."

"Kindness always comes back around."

"The power of a smile can change everything."

"Kindness is weakness to some. Not to me."