The purpose of life is knowledge (or more specifically, the encoding of data into information by use of symbols): The One Thing had to (quite schizophrenically) divide Itself because It had already observed All Else (forward through time, culminating in the Ultimate One which is by definition outside all space and time)... The Self was the final thing to observe (and thus create), but there is no reference point for observation when there is only one thing -- so It underwent the Pain of Division and became Many, backwards through time, so that the Joy of Dissolution could be experienced by All (which are really just parts of It), and create It again...
... Lather, rinse, repeat.
Recommended reading: The Physics of Immortality, and (to a lesser extent) The Physics of Christianity, both by Frank J Tipler (professor of physics and mathematics at Tulane University).
The former title is some of the most WTF, yet believable sci-fi cosmology speculation I have ever read. The latter title is even more WTF, but slightly less believable, but still extremely interesting.
The books mentioned are actually written in the language of math and physics, not the hokey new-agish crap I spewed at you in the opening paragraph.
I also want to give a "SHOUT OUTZ" to mah homey the Joint for starting this jagged thread... Represent the MidWaste, killah. Smoke ta dat! HELLANOIS WUT. ok i should sleep.
Hey also, the Joint -- have you ever watched that "China, IL" show on Adult Swim? It so fucking reminds me of my days at the local university... (SIUE). Man, I wish I had written that show back then rather than doing all those drugs.