This song is much complicated than all of you others seem to believe. It's about the complicated world that we live in, a world of extraneous variables and the larger possibility of pain rather than pleaseure. In this world, he feel dead inside, it is too complicated. He wants to extricate himself into a more simple world. Maybe a world of the 'past' where things were more simplifoed and the possibility of happiness far outweighed the latter, where there was more to go around and people weren't disenchanted with their relationships and purpose on life. He wants to leave the world and find a more satsfying/simple place for him to live. The metaphor of climbing to heaven refers to the struggle of leading a worthy life to reach salvation. Even the purest of people have had to comprimise their beliefs in this 'zero-sum' world we live in. By definition, the ownership of someting directly relates to someone else's lack of ownership. If it wasn't 'mine' it would be 'someone elses'. And that's the life he wants to escape.