I find the lyrics kind of simple, yet very basic foundation of how our brain grows and reaches new and new levels. Frame of mind literally means perspective, so first lets say when you are kid you have not many perspectives, and you play around safely in your little world, not even caring what is beyond that. Chorus goes about transition when your current frame of mind is shattered and you can still go with the last one, until you fix the mess in your head. And when your perspectives grow even more, you start braking many dogmas, because what I think dogma is also only a limited frame of mind, and unavoidably you reach resistance from other people, that you have either to stay between their lines or break through. Then the last part is most difficult one because it's when you break through and you actually don't know what to do, but it inspires you to reach for more and don't loose trust in yourself.