Psalms 57 focused on the hx of David's deliverance by God. David was not talking of corruption as in evil works, but the preservation of God's promise. The "michtam" psalms inscribed in stone placed in public settings were a visual reminder that David was only their king because of the mercy of God. God's mercy and truth allows for one way to salvation and not a different way for each person. David can rest and lie down by trusting God. David's goal of his kingship was to bring glory to God. When we have been broken on the truth and have to choose the right or the wrong way, our life's ambition should be to bring God glory.