Who said "I'm still learning to believe in myself."?

This quote is attributed to Courage the Cowardly Dog.

I'm still learning to believe in myself. - Courage the Cowardly Dog

"I'm still learning to believe in myself."

Courage the Cowardly Dog Education

"Courage, the cowardly dog."

"What's wrong, Muriel?"

"Oh, the things I do for love."

"Stupid Eustace!"

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."