But when Carter and Cash finally settled into being that “idyllic” couple, they were a really good one. And their son knew it, too. “My parents’ love for each other lasted throughout their whole life,” Cash said in 2007. “They didn’t give up… They accepted each other totally unconditionally.”
And the world has been fascinated by that love for years now. It’s been the subject of many movies, including the Oscar-nominated Walk the Line. But there’s perhaps no better illustration of it than the aforementioned 1994 love letter, a handwritten note that in 2015 was declared the best love letter of all time.