London: Matt Damon thinks marriage is "insane" but he feels very lucky to marry Luciana Borroso.
The "Martian" actor believes the concept of bonding your life to another person is a "crazy idea", reported Daily Telegraph.
"I think marriage is insane. It's a crazy idea. But I love being married to my wife," he said.
The 44-year-old actor - who has stepdaughter Alexia, 17, and daughters Isabella, nine, Gia, seven, and Stella, four, with Luciana - believes his secret to having such a happy marriage is to always feel "lucky" to be with his spouse of almost 10 years.
"I wouldn't tell anybody anything else about their relationship. I'm lucky I found my wife. If there's any secret it's that. It's to feel lucky."