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Study of systematic theology gives people a chance to evaluate the logical system they use and compare theirs to the systems other Spirit-filled people have constructed and used. Those who don't study systematic theology simply adopt a personalized system unconsciously - one that often lacks logical consistency. When you read many places in scripture that there is only one God, in many places you also read that the Father is God, and in many other places that Jesus, the Son, is God and many other places you read that the Spirit is God, you will make sense of all that information by placing it in some kind of intellectual system that you, personally construct and use. It is not because the bible is primarily systematic (it is not), but because your human brain is primarily systematic that is the basis for the necessity of making logical theological systems (as opposed to adopting them haphazardly). The question is not IF the bible student will systematize biblical information in his/her mind, but to what extent will the system the brain adopts be accurate and true. Some students have adopted the easiest system possible to store conflicting information - build a wall between conflicting facts. They systematically forget one aspect of God (holiness) when they remember the other (love)! The meaning of the atonement is an intersection that resolves the conflict between the love of God and the holiness of God, but the theological system that some have adopted sub-consciously will not allow those two traits to exist together. What does the fruit of that look like?