The Contrast...

 

Psalm 13:5 But I have trusted in your steadfast love;
    my heart shall rejoice in your salvation.
6 I will sing to the Lord,
    because he has dealt bountifully with me.

Psalm 14:1 The fool says in his heart, “There is no God.”
    They are corrupt, they do abominable deeds;
    there is none who does good.
2 The Lord looks down from heaven on the children of man,
    to see if there are any who understand,
    who seek after God.
3 They have all turned aside; together they have become corrupt;
    there is none who does good,
    not even one.

Above we find the closing words of Psalm 13, followed immediately by the opening words of Psalm 14. David began Psalm 13 by repeatedly asking "How Long, Lord?"  He kept seeing evil men and nations seem to triumph and prosper, while he and his people struggled and suffered. On the other hand, the fools all around him could seem to care less; they lived as if God does not exist and never brings about His righteousness.  David closes Psalm 14 by calling his people to trust and rejoice in their God, because they know He is their refuge and will restore and bring justice, no matter what the fools around may think.  There is a God; He is good; He will judge.