'Some of us are taught to think that reading the Bible means sitting in God's classroom and that prayer is politely raising our hand when we have a question about what he is teaching us in his Deuteronomy lecture. The Psalms, our prayer text within the biblical text, show us something quite different: prayer is engaging God, an engaging that is seldom accomplished by a murmured greeting and a conventional handshake. The engagement, at least in its initial stages, is more like a quarrel that a greeting, more like a wrestling match than a warm embrace.'
Eugene H Peterson, Eat this Book, p.104.