"We go through periods that aren't all rosy. I always say, life is long and you never know what's going to happen. If, God forbid, we were ever not to be together, I respect him so much as the father of my children. Like, I made such a good choice. He's such a good dad. You can never be relaxed or smug and think, 'I've got this thing.' That's also part of it: keeping yourself on your toes. I'm not going to take this for granted."
— In Elle's September 2011 issue, Gwyneth admitted that she's not sure if she'll be with husband Chris Martin forever.