I made what I originally thought was the mistake of asking my wife to take a look at the lyrics and tell me what she thought.  She made enough suggestions that I decided to keep (which significantly improved the song) that I had to give her co-writing credit where it was due.  Although I'm usually opposed to straying from my do-it-all-myself approach, this is a classic example of how co-writing (and re-writing for that matter) can definitely pay off.