4 Observe then, how the Apostle, alighting upon this same topic, and directing himself to those very Greeks who said, that they had not from the beginning learned the knowledge of God from the Scriptures, frames his answer. Having said that, “the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness;” when he saw that he was met by an objection; and that many would still enquire, from whence the Gentiles knew the truth of God, he goes on to add, “Because that which may be known of God is manifest in them.”
But how is it manifest in them? How were they able to know God, and who has showed? Declare this. “God,” says he, “has showed it unto them.” In what manner? By the sending of what kind of prophet? What evangelist? What kind of teacher? If the holy Scriptures were not yet given. “The invisible things of Him,” says he, “from the creation of the world are clearly seen, being understood by the things that are made, even His eternal Power and Godhead.” But what he means is just this, He has placed His Creation in the midst, before the eyes of all men; in order that they may guess at the Creator from His works; which, indeed, another writer has referred to; “For from the greatness and beauty of the creatures, proportionably the Maker of them is seen.” Do you see the greatness?
Marvel at the power of Him that made it! Do you see the beauty? Be astonished at the wisdom which adorned it! This it was which the prophet signified when he said, “The heavens declare the glory of God.” How then, tell me, do they declare it? Voice they have none; mouth they possess not; no tongue is theirs! How then do they declare? By means of the spectacle itself. For when you see the beauty, the breadth, the height, the position, the form, the stability thereof during so long a period; hearing as it were a voice, and being instructed by the spectacle, you adore Him who created a body so fair and strange!
The heavens may be silent, but the sight of them emits a voice, that is louder than a trumpet's sound; instructing us not by the ear, but through the medium of the eyes; for the latter is a sense which is more sure and more distinct than the former.
Source: Homilies on the Statues (New Advent)