The Psalms teach us to pray through imitation and response. … Real prayer is always an answer to God’s revelation. The Psalms are both prayer and revelations about God — the perfect ideal soil for learning prayer.
The Psalms take us deep into our own hearts 1,000 times faster than we would ever go if left to ourselves. … Religious/moral people tend to want to deny the rawness and reality of their own feelings, especially the darkness of them. … The secular world has almost made an idol of emotional self-expression. … But the Psalmists neither “stuff” their feelings nor “ventilate” them. They pray them — they take them into the presence of God until they change or understand them.
Most importantly, the Psalms force us to deal with God as he is, not as we wish he was. “Left to ourselves, we will pray to some god who speaks what we like hearing, or to the part of God we manage to understand. But what is critical is that we speak to the God who speaks to us, and to everything he speaks to us … the Psalms train us in that conversation” (from Eugene Peterson’s Answering God).