Ah, Psalms 7. I don't know why it's in the Bible, but it's there. David confronts his enemies and pleads with God to deliver him from their "malicious tongues." He talks about how wicked people have risen against him and how he depends on God's justice. It's definitely a lot of complaining, but he does eventually get to the point where he declares that God will judge the righteous and the wicked. So, if you find yourself in a bit of a pickle and need a reminder that God will take care of you, check out Psalms 7.