The First Amendment of faith
The problem with [many common] notions of prayer is that we cannot have an intimate relationship with someone to whom we cannot speak honestly–that is, someone to whom we cannot show our ugly side, or those large clay feet of ours. We in this culture are all psychologically astute enough to know that honest, unguarded speaking is essential to the health of family life or close friendship. But do we realize that the same thing applies to our relationship with God? That is what the Psalms are about: speaking our mind honestly and fully before God. The Psalms are a kind of First Amendment for the faithful. They guarantee us complete freedom of speech before God, and then (something no secular constitution would ever do) they give us a detailed model of how to exercise that freedom, even up to its dangerous limits, to the very brink of rebellion.
-Ellen F. Davis, “Improving our Aim: Praying the Psalms,” Getting Involved with God, pp. 8-9