I mean, I would just translate to the secular equivalent, "perfection is not a real thing". More concerning is the "image of the Creator" language, which is a short step from exactly the kind of hyper-idealism that he's critiquing in the first place. He does at least acknowledge that trying to achieve perfection in the real (or "the present") world is folly, but still, it's from a very different perspective than the secular one.