Psalm 36: "A Picture of the Wicked"
Proverbs 28:13-14 says, "whoever conceals his trangressions will not prosper, but he who confesses and forsakes them will obtain mercy. Blessed is the one who fears the Lord always, but whoever hardens his heart will fall into calamity."
This psalm is very similiar to those words spoken by Solomon in the Proverb above. Good and evil exists, and it exists because of the fall of Adam and Eve in the garden. Because of this, all of mankind was born into sin, in need of a savior. David describes how the trangressor (the sinner, the wicked) has no fear of the Lord, he builds himself up, he is full of trouble and deceitful in his words, he plots trouble, and does not reject evil. Now, David does not contrast this with a "good man", but instead with the Lord's character. The Bible teaches that there is no one righteous, so it only makes since that David speaks here of the steadfast love of the Lord, of His faithfulness, and of His righteousness. His prayer here is for the Lord to continue to show His steadfast love to those who are known by Him, and that those who are not, will recieve justice. The Lord's steadfast love (which we talked about in Psalm 33) speaks to the Lord's kindness, which, I wonder isn't a picture of grace. The Lord's steadfast love was a motive, but not the only motive, of the sacrificial death of Jesus on the cross (see John 3:16). One can clearly see the difference between the wicked, and that who is called Good, and we could also clearly see what happens to the wicked (see verses 6, 11-12). Which side do you fall on?