Actor Matt Damon thinks marriage is "insane".

The 44-year-old believes the concept of bonding your life to another person is a "crazy idea", but he adores being married to Luciana Borroso, reports femalefirst.co.uk.

Speaking on `Entertainment Tonight`, Damon said: "I think marriage is insane. It's a crazy idea. But I love being married to my wife."

The `Bourne` star who has stepdaughter Alexia, 17, and daughters Isabella, 9, Gia, 7, and Stella, 4, with Borroso, believes his secret to having 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," he said.