@Ren -- yeah you're right, telos must be what it's getting at... it's an idea I've always had trouble with, do you relate to it out of curiosity?; it seems like it's either kind of trivialized or unanswerable to me in the following sense: if something exists in most traditional senses, it has a nature. That nature would determine what it 'does.' Now, that may be sufficient for some to answer what the goal they must pursue is -- you do what's in your nature (could be pursuing pleasure/evading suffering, or something else.)
On the other hand, this doesn't answer
why the thing exists.
Given it exists, it has this purpose. However, only things that exist necessarily have anything like an intrinsic purpose, it seems.
I interpret the question of purpose as usually asking "why do I exist?" and the answer can't be "to do what is in your nature" because that's what you do, like a hamster on a wheel, GIVEN you exist. It doesn't explain
why you are there to do that hamster-wheel thing.
And it seems like the only things that have a strong argument for existing necessarily (if they do at all) are abstract objects, which, not coincidentally, are causally inert, hence don't
do anything!
Even if God created the world, this issue comes up: he's usually seen as responsible for all else, and perfectly sufficient in himself, thus his act of creation is free will. So, whatever purpose he imbues us with seems also deeply contingent, in the sense that he might have resisted creating us at all.
Now what if God existed by himself? Then it's odd, because he's not abstract, he has causal powers, but that's the point -- anything he does will not be an intrinsic outcome of his nature! Anything he does is CONSTRAINED by his intrinsic nature (he can't do evil). However, he doesn't have to
do anything but exist.