I have found it curiously interesting that Psalms 53 and 14 are virtually verbatim. As I have studied the seventy plus Psalms that David authored I have seen many of his characteristic phrases repeated, but as far as I have seen so far, these two are the only instance where he reproduced the same song. Maybe he felt the worshipers didn't get the message the first time and was compelled to make the point again. Or, possibly something was happening at the time that he felt a strong motivation to call attention to the message of this song. He makes his point at the beginning, "The fool says in his heart 'There is no God'". Psalm 53:1 ESV
Being a careful student of Jewish history, the Apostle Paul quotes this Psalm at Romans 3:10, stitching it together with about seven others to make the same point to his own generation, "None is righteous, no, not one; no one understands; no one seeks for God. All have turned aside; together they have become worthless; no one does good, not even one." All of that seems to be the result of an assumption that 'There is no God', so there are no rules, life is to be lived as you wish!
I wonder if this is how God sees his human family, ignorant, obstinate, self serving and totally oblivious to who He is. David's original assessment covers a lot of ground all the way down to Paul and the church at Rome, and even to the present day. When we compare the Biblical record with the archeological record, humans seem to have always worshiped some kind of god of their own making. Yahweh warned his own people repeatedly that creating their own gods or worshiping the gods created by other nations would only lead to their destruction. They failed to listen and now the nation of Israel still fights for its survival in the midst of constant war with one neighbor or another.
Have we really learned nothing in all the centuries between David and Paul? The brother did not mince his words when he quoted David's strong assessment of the human family that ignores God. It's still true, only "the fool says in his heart, there is no God!" But Paul uses David's words to make an even stronger point.
He follows up the Psalms quotes with an affirmation that "the law" was incapable of producing justification even for the Jews who believed in it. In spite of the rules God had given them to live by, the huge truth remained that, "all have sinned and fall short of the glory of God", both Jew and Gentile.
Now get this, regardless of the law and its requirements, all are now "justified by His grace as a gift, through the redemption that is in Christ Jesus." Romans 3:24
THAT is how God sees the human family, at least that is His intent for all of us, but the choice is still up to me. I can go on living like a fool, or I can move into God's house, be adopted into His forever family and have a life that every breathing member of the human race should want more than their next breath.
David also wrote: "Behold, God is my helper; the Lord is the upholder of my life!" Psalm 54:4 HALLELUJAH!