Lyric discussion by ivegotatimebomb 

The part about Grace reminds me of the Prodigal son.

that's the first thing i thought of too.

you're absolutely right. Mumford & Sons are known for being very generous with the literary references in their songs. It's about the prodigal son. Not alcoholism or a relationship.

Yeah, this, I think is also supported by the part that says:

"It’s not the long walk home that will change this heart, But the welcome I receive with the restart"

It reminds of the part of the story where the son has walks home in shame, and the father runs to him and hugs him and lets him in again.

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