3 “The Lord from heaven looked out upon the sons of men, to see if there be one understanding, or seeking after God”. 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 has 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.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)