Although maybe he was Lutheran, because they also ask Wozu hat uns Gott erschaffen? And they answer, Gott hat uns erschaffen damit wir ihn erkennen, ihn lieben, ihm dienen und dadurch in den Himmel kommen.
This can be cute up to a point, but if you simply want to keep the conversation at the level of being, there is nothing more to say.
Actually, the Catholics and Lutherans recognized a more fundamental order. They distinguish between being in itself and created being. Although even here, we might remember Aristotle and Plato. They are not the same, however. Just similarities.
I can understand Aristotle saying it, while also recognizing that Aristotle's use of terms such as "whole" and "end" would involve, not God as I think you believe, but real-world things.