Some couples get along well because they enjoy many similarities, but "Fixer Upper" stars Chip and Joanna Gaines are complete opposites of one another and yet they're doing great.

During their "I Am Second" interview, the reality stars opened up about their relationship and said that surprisingly, their differences are actually what help them understand God better.

Joanna described her husband as "risky," "dangerous," "care-free," and an "extreme dreamer" — everything she isn't.

"If you give Chip a boundary, he's going to break that boundary. If you give him a rule, he's not going to follow it. And if you tell him, 'You can't go over this line,' he's going to put his toe over it," Joanna said.

In contrast, Chip described his wife as the "purest, most stable person I've ever met." He added, "My wife is a bit of a wallflower. I joke with her pretty publicly that she was almost awkward when we first met."

It's amazing how these two polar opposites got along and fell in love with each other. The couple said their marriage is actually an "adventure." More than that, their differences also brought them closer to God and made them experience things they wouldn't have enjoyed without the other.

"If I didn't have Chip Gaines in my life, I'd still be dreaming in my head. But not acting out on any of that, not living it out," said Joanna.

She said Chip pushed her out of her comfort zone, and because of that, they were able to land a reality show, a book deal, and fuel their design business.

"God had a funny way of bringing me Chip. I almost have this reality of what it's like to follow Christ," she said, since being with her husband meant she's always thrust in situations where there's in discomfort or she's freaking out.

As for Chip, he learned how to become a stabilised person when he married Joanna. "When I caught her, I finally felt content for the first time in my life. I felt like I could be exactly who I was," he said. "I've learned so much about order and structure and processes through my wife. And God is all of those things to me now. But at the beginning, God was just chaotic to me. He was wild, untamed, [and] unruly."