Our minds have a finite processing power, why must it be within our comprehension what life is for when we don't even get how it works properly yet? Think of it like any foreign technology, you could try and determine what it's for by looking at it and thinking what you would design something like that for, but this is a flawed methodology. Instead, we should be looking at reverse engineering, taking everything to bits then putting it back together again, taking into account what everything is for. Presuming the creation can understand the creators motives, that is.
Ever wonder what a computer would think if you tried to explain to it why you made it?