3 If then it is strange that those things of which Christ said, “You have hid these things from the wise and prudent,” were hidden from such wise men as these, who, occupied wholly about the creatures, chose to seek the Creator carelessly, and could not find Him; still more strange is it that there should even be found some “wise and prudent” men who were able to know Him. “For the wrath of God is revealed from heaven against all ungodliness, and unrighteousness of men who hold the truth in unrighteousness.” Perhaps you ask, what truth do they hold in unrighteousness?
“Because that which may be known of God is manifest among them.” How is it manifest? He goes on to say, “For God has manifested it to them.” Do you still enquire how He manifested it to them to whom He gave not the law? How? “For the invisible things of Him from the creation of the world are clearly seen, being understood by the things that are made.” There were then some such, not as Moses the servant of God, not as many Prophets who had an insight into and knowledge of these things, and were aided by the Spirit of God, which they drew in by faith, and drank with the throat of godliness, and poured forth again by the mouth of the interior man.
Not such as these were they; but far unlike them, who by means of this visible creation were able to attain to the understanding of the Creator, and to say of these things which God has made; Behold what things He has made, He governs and contains also. He who has made them, Himself fills what He has made with His own presence. Thus much they were enabled to say. For these Paul also made mention of in the Acts of the Apostles, where, when he had said of God, “For in Him we live and move and have our being” (forasmuch as he was speaking to the Athenians among whom those learned men had existed); he subjoined immediately; “As certain also of your own have said.” Now it was no trivial thing they said; “That in Him we live and move and have our being.”
Source: Sermons on Selected Lessons of the New Testament (New Advent)