Who said "One must learn from one's mistakes."?

This quote is attributed to Droopy.

One must learn from one's mistakes. - Droopy

"One must learn from one's mistakes."

Droopy Education

"I'm so happy."

"Hello, I'm so glad to see you."

"That makes me so sad."

"I'm afraid I have some bad news."

"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."