"We're just here to be memories for our kids." That's how I remember the line, anyway. And it hits me with so much power, because I completely understand what that means. I heard a friend of mine once apologize to his son for all his mistakes, and I'll never forget what the son said in reply: "I only remember that you loved me, Dad." In the film, the powerful scene in Murph's bedroom is book-ended by an aged Murph answering the question of how she held out hope for so long: "Because my dad promised me." Greydanus gave the film a mildly negative review, but describing it as having genuinely affective character development. You don't say! It reminds us to be who we're supposed to be, relying on God's mercy for the rest.