"Ain't it the sinner who gets all the grace sometimes?"

That's one of my favorite lines from the new Faith Hill/Tim McGraw duet, "Keep Your Eyes on Me."

Officially, the song isn't a single, and technically, I haven't heard it all the way through. But I've been to enough movies recently where I've seen the full-length trailer for The Shack and have heard almost all of the movie's theme song.

Plus, Hill just posted the lyrics on her Instagram page.

So I know now I love the lyrics already, with lines like "It's human to hurt the one you love the most," and "You can't find your way home sometimes," and "Keep your eyes on me when the light in your heart is too burned out to see."

Hill and McGraw wrote this one together, which is rare for them. But if this song is any indication of how good they are as co-writers, I hope they'll add more songwriting credits to their long list of accomplishments.

McGraw is featured in the the movie, playing the role of Willie, a good friend to the grieving father Mack.

The soundtrack album, The Shack -- Music From and Inspired by the Motion Picture, will be released on Feb. 24, and the movie is set to open on March 3.

The album also includes several other country artists, including Brett Eldredge ("Phone Call to God"), Lady Antebellum ("Lay Our Flowers Down"), Dierks Bentley ("Days of Dark") and Dan + Shay ("When I Pray for You"), along with Kelly Clarkson and Aloe Blacc's collaboration on " Love Goes On."