Who said "I think I finally understand what love is."?

This quote is attributed to Peter Griffin.

I think I finally understand what love is. - Peter Griffin

"I think I finally understand what love is."

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!"