Arcade Fire - "Ready to Start"

Arcade Fire - "Ready to Start": "This definitely shook out as my favorite song on the new Arcade Fire record. I've read around that this is supposed to be an uplifting song (I suppose the 'now I'm ready to start!' ending), but the song - and the chorus in particular - read really dark to me, outside of that one line. There's something really sad about the 'if I was pure / you know I would / and if I was yours / but I'm not' lyric, but it still comes together as a really powerful song and that's why I like it."