Indeed; scientists conduct root cause analysis, philosophers and theologians ask what is the ultimate essence, moral philosophers ask meta-questions ... It would then seem natural for Christians, particularly when we possess the revealed Word of God in written and living form, to seek to know the why behind our actions, and to get to the root of sin. All too often we are content to talk about the fruit of sin, as if its sin, because that is where legalism lives and breathes. Its lazy Christianity. The law was given so that we might do our own root cause analysis and realize the depth of sin in the soil of our hearts, from root to fruit. We don't need an axe to cut off offending branches, we need a shovel to dig every last fiber of the root structure out. The Genesis account becomes even more brilliant when you consider the original sin began long before the fruit was eaten.
And only One can remedy this delimma. Over the last several years this has been at the root of my searching. I'm filtering through the generations of the reformation trying to grasp more of the whole of what happened. A pleasant surprise is to find the simplicity with which Luther looked at the human condition. I appreciate the focus of the Sunday corporate worship. It is not a meeting to focus on the feelings of the congregant.
The primary purpose of the service is not to worship God in a modern conceptualization. The focus is God himself. God coming to his people and bringing his good gifts to them through word and sacrament. God's voice is the first voice. The congregants response is the second voice and responds in thanksgiving and praise once the first voice has spoken.
We have been taught that our voice is the first voice. We go to do something for God when in actuality we go so that God can bring Christ and the Gospel to us and nourish our souls. We may feel emotion or we may sit there quietly in contemplation. It is not about what we feel but the truth of God and his promises.
So, even in worship, in our attempts to worship God, we can look at the fruit of our actions and see that they come from a motive of self fulfillment, emotional buzz, need for "whatever" and find ourselves looking at the fruit of our actions and practicing legalism.
Some will look at Luther and say "He promoted formality and ritual" and miss the greater message. Luther saw clearly that sin was rooted deep in the heart of man and that Christ alone, Christ and Christ crucified was the answer to all of the needs of the heart of man and inherent sin. Since the root was within, Christ was the only remedy.
A bit of a tangent but I wanted to tie those things together with your statement and demonstrate an area where we have deviated from Biblical orthodoxy to happily practice legalism.