Lyric discussion by simonsaysncsu 

Cover art for Gravity lyrics by John Mayer

Aren't there any other 20-somethings out there?

This song is about not understanding his constant craving for more, regardless of what he has. In this song's context, it's about relationships, yet the meaning could easily be applied to careers and life in general.

What makes him want more? What prevents him from ultimate commitment? Gravity.

Another thing, it's not necessarily about someone else in particular or cheating. It's simply about never being truly satisfied because of an uncontrollable craving. aka. Gravity.

I think what he means by "keep me where the light is" is "keep me satisfied and happy without something more or different" The peace he's talking about is 100% sheer satisfaction, rather than 99% sure with a 1% gravity factor--that will inevitably grow to trip him up.

Just my $0.02!