The Lord looked down from heaven, to search out the truth. God knoweth all things without any inquiry; but this is a figure called anthropopathia, whereby Scripture oft speaks of God after the manner of men. Upon the children of men; upon the whole body of the Israelitish nation, and upon the generality of mankind under heaven; for he speaks of all except his people, and the righteous ones, who are here opposed to these, Psalms 14:4,5. That did understand, and seek God; that did truly know God, to wit, so as to love, and fear, and trust, and obey him, (for all these are frequently signified in Scripture by this expression of knowing God) and that did diligently seek him, i.e. study his mind and will, that they might do it, and seek his grace and favour.
Related Commentaries of Psalms 14:2
Psalms 14:2
2 The LORD looked down from heaven upon the children of men, to see if there were any that did understand, and seek God.