For myself I like to think that there is some plane of existence in which the essence of me investigated the different possible places I could go, if I so choose, and for some reason I decided to come to this planet. Why would I choose to come here though, I like to pretend there are rules in choosing.
- Moving to certain planes means you don't get to have knowledge that other planes exist and what they are really like. If you learn about them, you have to take them on faith.
- When in one of the planes where you can see the other ones, you can't go to them all directly, you need to pass through another before, and depending on how you conduct yourself you may or may not get to go to the plane you were aiming at initially.
- When you go to a new plane (one where you don't have knowledge of the existence of other planes) you don't get to choose which life you'll be born into, you take your chances.
I could take the selfish route, there was some other plane I wanted to get to and although earth was one of multiple routes, maybe it was the shortest. I wouldn't be here more than 125 years (and likely less), maybe the other planes I could have lived for hundreds of years.
Alternately, maybe I looked upon the earth and I saw something I wanted to participate in, for example
- The great joys possible here in pursuing relationships with other people
- Helping people that are in pain or righting a societal injustice
- Experiencing faith in things that are unprovable
I think in figuring this out would help me feel purposeful and happy, because if I'm not doing what I thinking I'm supposed to be doing, then I'm not going to be happy.