Chapter 14 — Part I: The Creed — Article XII: Life Everlasting
Section 17. This St. Denis' also clearly shows when he says that the things above cannot be known by comparison with the things below; for the essence and substance of anything incorporeal cannot be known through the image of that which is corporeal, particularly as a resemblance must be less gross and more spiritual than that which it represents, as we easily know from universal experience. Since, therefore, it is impossible that any image drawn from created things should be equally pure and spiritual with God, no resemblance can enable us perfectly to comprehend the Divine Essence. Moreover, all created things are circumscribed within certain limits of perfection, while God is without limits; and therefore nothing created can reflect His immensity.