Who said "I've learned that the hard way."?

This quote is attributed to Peter Griffin.

I've learned that the hard way. - Peter Griffin

"I've learned that the hard way."

Peter Griffin Knowledge

"Shut up, Meg."

"All right, all right, I'm coming, Elizabeth."

"Giggity!"

"You know what really grinds my gears?"

"We're not just after treasure. We're preserving history."

"The mind is humanity's greatest tool."

"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."