Psalm 36 is a lament regarding the wicked who oppose the faithful and the steadfast love of the LORD.  It concludes with a prayer that God in his steadfast love will protect his people from the attacks of the wicked.

1-4 – The singer begins by stating that the wicked act without fear of God.  Who are the wicked?  The wicked are those who do not reject evil but who are given over to committing such acts of evil.  The wicked flatter themselves.  The wicked believe that God cannot see their sins.  They wicked always lie; they do not act wisely nor act good.

5-9 – In contrast God acts with steadfast love and faithfulness to his holy godly people.  We also see other attributes of God such as righteousness, and justice.  God figuratively takes his faithful people under the refuge of his wings. God nourishes them from the fountain of life, and so they may see the light, that is so that they may experience life.

10-12 – The final prayer is that God, through his steadfast love, will protect the faithful people of God from the wicked.  The faithful people of God are the upright of heart.