Who said "I've learned that love is the most powerful thing."?

This quote is attributed to Peter Griffin.

I've learned that love is the most powerful thing. - Peter Griffin

"I've learned that love is the most powerful thing."

Peter Griffin Love

"Shut up, Meg."

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

"Giggity!"

"You know what really grinds my gears?"

"I love my wife, but sometimes she drives me crazy."

"Love conquers all obstacles."

"Love is patient, love is kind."

"I'm not stupid, I'm just in love!"