The LORD looked down from heaven upon the children of men, to see if there were any that did understand, and seek God.
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Augustine of Hippo
3. "The Lord from heaven looked out upon the sons of men, to see if there be one understanding, or seeking after God" (ver. 2). It may be interpreted, upon the Jews; as he may have given them the more honourable name of the sons of men, by reason of their worship of the One God, in comparison with the Gentiles; of whom I suppose it was said above, "The fool hath said in his heart, There is no God," etc. Now the Lord looks out, that He may see, by His holy souls: which is the meaning of, "from heaven." For by Himself nothing is hid from Him. ...
God. Those only who seek God, understand their real interests. (Haydock)
The pagans, and particularly those of Babylon, lived in the greatest dissolution, so as to call loudly for vengeance, ver. 5. (Calmet)
Both the understanding and the will were gone astray. (Berthier)