Psalms have been something that I have for years thought was a balance in Scripture. Paul's letters reach the mind and makes you wonder, but certainly when the Lord told us the greatest commandment is to love the Lord our God with all our heart, soul and might, he meant to include that we should love the Lord with our emotional aspects of our being. So the Psalms seemed to be a solution or balance with those who might make Christian religion an egg head, mind centric sort of thing. But I recently read through the Psalms with refreshing insights. For the first time I saw the Psalms as theological. Take for instance, Psalm 65:2 tells us that, "When iniquities prevail against me, you (God) atone for our transgressions." In this we see substitutionary sacrifice for sin. It points to God being the source of the atonement, not man. Another Psalm with theological insights is Psalm 82:8 where it says, "Arise, O God, judge the earth; for you shall inherit all the nations." This give rational for God judging all nations because he shall inherit all nations. There is a hint of all nations coming to the Lord of Glory, being some what of a foreshadowing of the Great Commission.
Feasting on the Psalms without finding theology is sort of like eating a sandwich without tasting the meat. It is good to have a tomato, lettuce and mayo on a sandwich but you need some bacon or salami to bring it all together. Theology in the Psalms brings it all together.