This is the most important song I’ve ever written, it’s a time capsule song. I will listen to it every day of my life if I need to. It’s honest to God the most important song I’ve ever written in my life, and it has the fewest words. I was in LA, and I was there for the summer, just writing tunes, and I was in the shower. And I don’t know where it came from, but it’s the damn truth you know, and I just sang, “gravity…is working against me.”
And I just want to say that my full-time job, being—this is true—being a musician is almost a side job to my full-time job of not screwing up. Because the world was devised to be pretty damn even, except for terminal illness, and things that people just absolutely… They’re just flukes and they’re… You know, I don’t know if they’re making up for something else way far away that they don’t deserve, but it all pretty much evens out.

[…]

Umm, this is a song about… making sure you still love yourself… making sure you still have your head on, making sure you still say no the way your mom would say no. And I will need it every damn day of my life because it’s easier to mess up than it is to stay here.

Mayer, taken from a video in which he explains Gravity on stage