"That the universe exists" isn't a sufficient explanation since we know that it doesn't exist of necessity (since it is composed of parts). The argument doesn'

"That the universe exists" isn't a sufficient explanation since we know that it doesn't exist of necessity (since it is composed of parts). The argument doesn't say anything about what this "First mover" is like, only that it must be sufficient to explain the effects it produces (which includes being-a-person since that's qualitatively different than not-being-one). It's only when you come to the realization that to-be is the same as to-be-beautiful is the same as to-be-true that things start to look vaguely like the God of the burning bush and the problem of pain starts to raise its head (and then you have to meet the cross and either break on it or be saved by it).