Psalm 37 offers real wisdom and perspective on why the wicked prosper and the righteous suffer. This psalm is a song to trust the judgment and salvation of God.
This is a very personal hymn of joy that focuses on the goodness of the Lord.
Psalm 5 is a prayer for protection from deception. Only before the true God will we find the truth and be defended from the deception of Satan and his cronies.
The message of Psalm 4 is as follows: having cried out to God for help, the psalmist warned his enemies not to sin against God by wronging him, because God had set him apart in protective care, a fact that caused him to rejoice in the face of opposition.