This is a song about starting a special relationship with a woman. Urban says in the lyrics that she doesn't need to be afraid to love him, because she knows how much he loves her. He also says it's tough, but he'll never give up because what they share is a "Once in a Lifetime Love."
On September 2, 2006, "Once in a Lifetime" hit the #17 spot on the Billboard Hot Country Song charts, making it the fastest rising song in the history of modern Country music. Urban's record was beaten by Kenny Chesney's "Don't Blink," which debuted at #16 on the Billboard Hot Country Song charts for the week of September 8, 2007. Then a week after that Garth Brooks' "More Than a Memory " debuted at #1 on the Country chart.
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Urban recalled during a 2014 concert at the Rod Laver Arena that he wrote the song in 2006 a day after talking with Nicole Kidman about their impending wedding day. "Nic was getting very nervous about marrying me," he recalled. "She was saying things like, 'It's a long shot,' (but) I knew she loved me and was just nervous. I did everything I could to remind her that I was going to be her man forever."