Psalm 18 is David’s song of praise to God for dealing with all the injustices perpetrated against him. He trusted God to deliver him from his enemies, and God Did. Thus he sings:

The Lord lives! Blessed be my rock! May the God of my salvation be exalted! He is the God who pays back those who harm me;
he subdues the nations under me and rescues me from my enemies. You hold me safe beyond the reach of my enemies; you save me from violent opponents.For this, O Lord, I will praise you among the nations; I will sing joyfully to your name.

God WILL take care of it! We can trust Him. We don’t have to avenge ourselves or retaliate against our enemies! We truly can trust God! He will make it all right! Whateve it is! Let Go and Let God take care of it!